Bowling ball core · Hammer

Hammer Obsession Core

Asymmetric Hammer core

An asymmetric core with early rev-up and medium flare, built for medium to heavy oil. Balls with this core are no longer available at BowlersMart.

  • Asymmetric
  • RG 2.468
  • Diff 0.050
  • MB 0.013
Hammer Obsession symmetric core shape inside the ball

Specs

RG AT 15 LB

2.468

Early rev-up

Revs soonerRevs later

2% of the reactive and urethane balls we stock have a lower RG.

DIFFERENTIAL AT 15 LB

0.050

Medium flare

Less flareMore flare

59% of the reactive and urethane balls we stock have a lower differential.

MASS BIAS AT 15 LB

0.013

Mild asymmetry

MilderStronger

13% of the asymmetric reactive and urethane balls we stock have a lower mass bias.

RG How soon the ball revs up.Differential How much the ball can flare.Mass bias How asymmetric the core is.
Hammer Obsession Core specs by ball weight
Weight RG DifferentialDiff Mass biasMB
16 lb 2.484 0.042 0.011
15 lbUsed on this page 2.468 0.050 0.013
14 lb 2.495 0.050 0.012
13 lb 2.597 0.041 0.014
12 lb 2.593 0.041 0.014

Source: Hammer published specs, as shown on BowlersMart’s original Hammer Obsession core page (2022). RG and differential change with ball weight; use the row for the weight you throw. The highlighted 15 lb row is the one used on this page.

Looking for a ball like your Hammer Obsession?

Balls with the Hammer Obsession Core are no longer available at BowlersMart. These in-stock balls have the closest RG and differential.

Hammer Full Effect Bowling Ball

Hammer Full Effect

Hammer HK22C2 Hybrid Reactive

Medium to heavy oil

Sale price $194.95 Regular price $279.95In stock
Storm Bionic Bowling Ball

Storm Bionic

Storm NRG Hybrid Reactive

Medium to heavy oil

Sale price $184.95 Regular price $249.95In stock
Columbia 300 Street Rally Bowling Ball

Columbia 300 Street Rally

Columbia 300 Formula 1 Pearl Reactive

Medium to heavy oil

Sale price $139.95 Regular price $289.95In stock
Brunswick Energize Bowling Ball

Brunswick Energize

Brunswick HK22C EVO Hybrid Reactive

Medium to heavy oil

Sale price $164.95 Regular price $249.95In stock
DV8 Intense Collision Bowling Ball

DV8 Intense Collision

DV8 HK22C2 Havoc Pearl Reactive

Heavy oil, medium oil

Sale price $189.95 Regular price $279.95In stock
Ebonite Spartan Bowling Ball

Ebonite Spartan

Ebonite HK22C2 Optimize Solid Reactive

Heavy oil

Sale price $164.95 Regular price $279.99In stock

Balls with the Hammer Obsession Core

None of the 2 balls with the Hammer Obsession Core are in stock at BowlersMart right now.

Show 2 balls no longer available at BowlersMart
More bowling balls with the Hammer Obsession Core
Ball Cover First seen
Hammer Obsession Bowling Ball Hammer Envy Solid CFI Solid Reactive January 2021
Hammer Super Obsession Overseas Bowling Ball Hammer Aggression NE Pearl Reactive July 2021

Where the Hammer Obsession sits

Each dot is a core in balls we stock. Cores close together roll alike; the cover and layout decide the rest.

DV8 Larceny Core, RG 2.471, diff 0.028DV8 Renegade Core, RG 2.499, diff 0.040Track I-Core Gen4, RG 2.480, diff 0.053Brunswick Vintage Light Bulb Low RG Core, RG 2.568, diff 0.032Brunswick Dual Centric Core, RG 2.509, diff 0.047Ebonite Big Time Core, RG 2.500, diff 0.054Hammer Stacked LED Core, RG 2.545, diff 0.047Hammer Vindicator Core, RG 2.474, diff 0.053Radical Vexed Variant Asymmetric Core, RG 2.490, diff 0.045Radical Modified Intel Symmetric Core, RG 2.483, diff 0.032Motiv Affliction V2 Core, RG 2.480, diff 0.055900 Global Conduit A.I. Core, RG 2.590, diff 0.050Roto Grip GEM A.I. Core, RG 2.490, diff 0.057Hammer Obsession Tour, RG 2.469, diff 0.034Hammer Super Offset Core, RG 2.524, diff 0.053Hammer Gas Mask Core, RG 2.500, diff 0.058Ebonite Turbo Core, RG 2.510, diff 0.040Ebonite Centrex Symmetrical Mass Bias, RG 2.460, diff 0.056Motiv Excel Core, RG 2.550, diff 0.030Motiv Detonator Core, RG 2.470, diff 0.055Storm Solarion AI Core, RG 2.480, diff 0.054SWAG Insanity Symmetric Core, RG 2.520, diff 0.034SWAG Fusion Symmetric Core, RG 2.540, diff 0.036SWAG Watcher Symmetric Core, RG 2.510, diff 0.048SWAG Dragon Asymmetric Core, RG 2.480, diff 0.054SWAG Executioner Asymmetric Core, RG 2.500, diff 0.051Motiv Predator V2 Core, RG 2.470, diff 0.054Storm C3 Centripetal Control Core, RG 2.490, diff 0.029Roto Grip Rondure MaxD Core, RG 2.500, diff 0.058Hammer Vibe Core, RG 2.510, diff 0.042Hammer Aftermath Core, RG 2.520, diff 0.052Brunswick Alert Core, RG 2.478, diff 0.037Brunswick Rampart Core, RG 2.502, diff 0.051Track MC2 Asym Core, RG 2.470, diff 0.046Radical Evil Eye Symmetric Core, RG 2.490, diff 0.046Radical No Doubt Symmetric Core, RG 2.480, diff 0.051Storm Surge Core, RG 2.580, diff 0.024Roto Grip Hyped UP Core, RG 2.500, diff 0.042Roto Grip Morph-Wing Core, RG 2.510, diff 0.051Brunswick Fury Core, RG 2.524, diff 0.038Motiv Sigma Core, RG 2.470, diff 0.047Roto Grip Hustle Core, RG 2.530, diff 0.030900 Global Blast AI Core, RG 2.470, diff 0.055900 Global Strobe AI Core, RG 2.510, diff 0.052Radical Guru Core, RG 2.500, diff 0.044Track I-CORE 3.0, RG 2.480, diff 0.056DV8 Unholy Core, RG 2.500, diff 0.051Brunswick Infinity Core, RG 2.521, diff 0.051Storm Catalyst Core, RG 2.500, diff 0.052Hammer Gauntlet Core, RG 2.501, diff 0.050Hammer Raw Hammer Core, RG 2.537, diff 0.038Storm Atmos A.I. Core, RG 2.530, diff 0.042Storm Booster Core, RG 2.540, diff 0.046Track Shuttle Core, RG 2.490, diff 0.038Brunswick Light Bulb Core, RG 2.524, diff 0.030Radical Sneak Attack Core, RG 2.540, diff 0.036Motiv Gear Core, RG 2.480, diff 0.034Hammer Super LED Core, RG 2.632, diff 0.034Ebonite Enhanced V2 Core, RG 2.480, diff 0.048DV8 Dualistic Core, RG 2.490, diff 0.045Radical Vexed Asymmetric Core, RG 2.490, diff 0.036Motiv Quadfire Core, RG 2.550, diff 0.043Track Stealth Core, RG 2.480, diff 0.056Brunswick Tiered Hexagon Core, RG 2.540, diff 0.045Columbia 300 Piranha Core, RG 2.550, diff 0.043Storm Element Max AI Core, RG 2.470, diff 0.055Storm Radius Core, RG 2.610, diff 0.020Roto Grip Rondure Tour X Core, RG 2.480, diff 0.034SWAG Unreal Core, RG 2.510, diff 0.047SWAG Craze Core, RG 2.520, diff 0.030SWAG Serpent Asymmetric Core, RG 2.510, diff 0.048Radical Torpedo Asymmetric Core, RG 2.480, diff 0.054Motiv Overload, RG 2.480, diff 0.050DV8 Duality Core, RG 2.480, diff 0.036Hammer Spheroid Core, RG 2.480, diff 0.048Radical Outer Limits Asymmetric, RG 2.490, diff 0.051Motiv Apex Predator Core, RG 2.520, diff 0.055Brunswick Danger Zone Core, RG 2.501, diff 0.048Storm RAD-TQ Core, RG 2.560, diff 0.051Storm Velocity Core, RG 2.480, diff 0.051Hammer LED Resin Bowling Ball Core, RG 2.586, diff 0.027Epic Spark Core, RG 2.540, diff 0.049Motiv Hadron Dual Density Core, RG 2.500, diff 0.045Track Criterion ID Core, RG 2.490, diff 0.047Brunswick Zone Asymmetric Core, RG 2.478, diff 0.048Ebonite Entity Core, RG 2.510, diff 0.052Roto Grip Rocker AI Core, RG 2.480, diff 0.050Motiv Flux Core, RG 2.570, diff 0.015DV8 Mantra Core, RG 2.490, diff 0.047Hammer Gas Mask Low Diff Core, RG 2.500, diff 0.034Roto Grip RST Core + AI, RG 2.520, diff 0.055Motiv Impulse V2 Core, RG 2.550, diff 0.050SWAG APX V1 Core, RG 2.500, diff 0.042SWAG Fusion Core, RG 2.540, diff 0.036SWAG Judge Core, RG 2.490, diff 0.052900 Global Magna AI Core, RG 2.490, diff 0.044Roto Grip Rondure Core, RG 2.490, diff 0.052Columbia 300 Pulse PowerCOR, RG 2.460, diff 0.045Storm Element Tour A.I. Core, RG 2.470, diff 0.035KR Strikeforce KR Launch Core, RG 2.530, diff 0.047900 Global Ellipse Asymmetric A.I. Core, RG 2.480, diff 0.050Motiv Halogen Core, RG 2.550, diff 0.037Storm C3 + AI Core, RG 2.480, diff 0.031Motiv Gear APG, RG 2.470, diff 0.036Radical Snapshot Symmetric Core, RG 2.520, diff 0.050Hammer High Rev Offset Core, RG 2.489, diff 0.053Hammer Huntsman Tour Core, RG 2.472, diff 0.036Hammer LED Core, RG 2.650, diff 0.015Storm Inverted Fe2 Core, RG 2.570, diff 0.046Storm Capacitor Core, RG 2.570, diff 0.022Storm Velocity A.I. Core, RG 2.470, diff 0.053Storm Atomic Core, RG 2.480, diff 0.053Storm RAD-X Asymmetric, RG 2.480, diff 0.054Storm ID AI Core, RG 2.510, diff 0.055Hammer FAB Asymmetric, RG 2.550, diff 0.051Radical Modified Intel Symmetric, RG 2.480, diff 0.032Columbia 300 Columbia Ricochet Core, RG 2.480, diff 0.054Roto Grip Defense AI Core, RG 2.490, diff 0.053Storm Centripetal HD A.I. Core, RG 2.460, diff 0.056Hammer Modified Infamous Core, RG 2.567, diff 0.049Brunswick Ethos Core, RG 2.480, diff 0.053Hammer Hazmat Core, RG 2.470, diff 0.055Track Criterion MD Core, RG 2.500, diff 0.052Storm Ignition Core, RG 2.490, diff 0.052Roto Grip Momentous A.I. Core, RG 2.480, diff 0.049Brunswick Portal X Core, RG 2.473, diff 0.054Ebonite Emerge Core, RG 2.510, diff 0.053Radical Katana Core, RG 2.500, diff 0.050900 Global Meditate LD Symmetric Core, RG 2.560, diff 0.027Columbia 300 Movement Core, RG 2.510, diff 0.053Hammer Huntsman Core (pictured: Hammer Maximum Effect Bowling Ball)1Columbia 300 Shifter Core (pictured: Columbia 300 Street Rally Bowling Ball)2Storm Torsion AI Core (pictured: Storm Bionic Bowling Ball)3DV8 Collision Core (pictured: DV8 Intense Collision Bowling Ball)4Ebonite Iron Fist V2 Core (pictured: Ebonite Spartan Pearl Bowling Ball)5Storm Supercoil Core (pictured: Storm Blaze DNA Overseas Bowling Ball)6Hammer Obsession Core (pictured: Hammer Super Obsession Overseas Bowling Ball)EARLY REV-UPMID-LANELATER REV-UPHIGH FLAREMEDIUMLOW FLARE2.442.482.522.562.602.642.680.0100.0200.0300.0400.0500.060RG at 15 lbDifferential at 15 lb← Revs up soonerRevs up later →More flare ↑Less flare ↓

Nearest cores, zoomed in

Hover or tap a dot for that core’s numbers. Click a dot to open its page. Drag to move around when zoomed in. The same RG and differential do not guarantee the same ball motion.

Same family: Hammer Obsession Tour

This core 1 Nearest cores Other cores

Nearest cores to the Hammer Obsession Core
Core Brand Shape RG Diff vs this core
Hammer Maximum Effect Bowling Ball1Hammer Huntsman CorePictured: Hammer Maximum Effect
 Hammer Asymmetric 2.470 0.050 RG +0.002 · Diff 0.000
Columbia 300 Street Rally Bowling Ball2Columbia 300 Shifter CorePictured: Columbia 300 Street Rally
 Columbia 300 Asymmetric 2.470 0.050 RG +0.002 · Diff 0.000
Storm Bionic Bowling Ball3Storm Torsion AI CorePictured: Storm Bionic
 Storm Symmetric 2.470 0.050 RG +0.002 · Diff 0.000
DV8 Intense Collision Bowling Ball4DV8 Collision CorePictured: DV8 Intense Collision
 DV8 Asymmetric 2.462 0.052 RG −0.006 · Diff +0.002
Ebonite Spartan Pearl Bowling Ball5Ebonite Iron Fist V2 CorePictured: Ebonite Spartan Pearl
 Ebonite Asymmetric 2.470 0.053 RG +0.002 · Diff +0.003
Storm Blaze DNA Overseas Bowling Ball6Storm Supercoil CorePictured: Storm Blaze DNA Overseas
 Storm Asymmetric 2.470 0.053 RG +0.002 · Diff +0.003

Matches use 15 lb RG and differential.

Drilling and tools

Drilling layoutsLayout guides for symmetric and asymmetric ballsDual angle converterTurn a pin to PAP layout into a dual angle layout

The Obsession and Obsession Tour have the same core shape; however, the Tour edition differential is .016 points lower, creating less flare, less hook, and a more controllable reaction compared to the regular Obsession.  

From Hammer’s description

Questions bowlers ask

What is the RG of the Hammer Obsession Core?

At 15 lb the Hammer Obsession Core has an RG of 2.468. It ranges from 2.468 to 2.597 across the listed weights.

What is the 14 lb RG of the Hammer Obsession Core?

At 14 lb the RG is 2.495.

What is the differential of the Hammer Obsession Core?

At 15 lb the differential is 0.050. The mass bias is 0.013.

Which bowling balls use the Hammer Obsession Core?

Hammer Obsession Bowling Ball, Hammer Super Obsession Overseas Bowling Ball. 0 are in stock now.

Can I still buy a ball with the Hammer Obsession Core?

Balls with this core are currently unavailable at BowlersMart. Closest in-stock alternatives by RG and differential include Hammer Full Effect Bowling Ball, Storm Bionic Bowling Ball, Columbia 300 Street Rally Bowling Ball, Brunswick Energize Bowling Ball, DV8 Intense Collision Bowling Ball, Ebonite Spartan Bowling Ball.

How do the Hammer Obsession Core specs change by weight?

At 16 lb: RG 2.484, differential 0.042, mass bias 0.011. At 12 lb: RG 2.593, differential 0.041, mass bias 0.014.

How does the Hammer Obsession Core compare with my ball?

Type the ball you throw into the Compare with your ball box on this page. It shows the RG and differential side by side and saves your bag for every core page.

Sources and method

Specs. Hammer published specs, as shown on BowlersMart’s original Hammer Obsession core page (2022), as published by the manufacturer.

Baseline. The baseline is 265 in-stock, published reactive and urethane balls. Plastic and polyester covers, 2-piece, 3-piece and pancake cores, missing covers and missing RG or differential values are excluded.

Percentiles. Percentiles are the share of baseline balls with a strictly lower or higher value; ties are not counted.

Nearest cores. Nearest cores are ranked by distance on standardized 15 lb RG and differential, with the same symmetric or asymmetric shape preferred among near ties (distance bands of 0.1).

Mass bias. Mass bias is compared among asymmetric balls with numeric mass bias only.

Updated. Catalog and page updated 2026-10-16.

Next lesson

Compare cores by RGEvery in-stock ball from lowest to highest RGCompare cores by differentialEvery in-stock ball from lowest to highest differentialAll bowling ball coresCore libraries for every brand we carryHammer core libraryEvery Hammer core we have specs for