Bowling ball core · Hammer

Hammer LED Core

Symmetric Hammer core

A symmetric core with later rev-up, more length and low flare, built for dry to medium oil. 2 of the 4 balls with this core are in stock at BowlersMart.

  • Symmetric
  • RG 2.650
  • Diff 0.015
Hammer LED symmetric core shape inside the ball

Specs

RG AT 15 LB

2.650

Later rev-up, more length

Revs soonerRevs later

99% of the reactive and urethane balls we stock have a lower RG.

DIFFERENTIAL AT 15 LB

0.015

Low flare

Less flareMore flare

0% of the reactive and urethane balls we stock have a lower differential.

MASS BIAS AT 15 LB

None

Symmetric core

Symmetric cores have no mass bias marker to place when drilling.

RG How soon the ball revs up.Differential How much the ball can flare.Mass bias How asymmetric the core is.
Hammer LED Core specs by ball weight (reference ball: Hammer Purple Pearl Urethane)
Weight RG DifferentialDiff Mass biasMB
16 lb 2.610 0.030 None
15 lbUsed on this page 2.650 0.015 None
14 lb 2.680 0.013 None
13 lb 2.631 0.020 None
12 lb 2.628 0.026 None

Source: Hammer published specs, as listed on the Purple Pearl Urethane product page. 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.

Balls with the Hammer LED Core

2 of the 4 balls with the Hammer LED Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.

Urethane covers

Urethane gives a smooth, controllable arc for drier lanes and short patterns.

Hammer Black Pearl Urethane Bowling Ball

Hammer Black Pearl Urethane

Urethane Pearl 78D

Dry to medium oil

Sale price $149.95 Regular price $229.95In stock
Hammer Purple Pearl Urethane Bowling Ball

Hammer Purple Pearl Urethane

Hammer Pearl Urethane

Dry to medium oil

Sale price $149.95 Regular price $229.95In stock
Show 2 balls no longer available at BowlersMart
More bowling balls with the Hammer LED Core
Ball Cover First seen
Hammer Magenta Urethane Overseas Bowling Ball Hammer Performance Urethane Solid June 2024
Hammer Black Solid Urethane Overseas Bowling Ball Hammer Performance Urethane Solid November 2024

Shop the 2 available balls with this core

Where the Hammer LED 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 2.560, diff 0.032Brunswick Dual Centric Core, RG 2.500, 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 2.460, 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 2.470, diff 0.037Brunswick Rampart Core, RG 2.500, diff 0.051DV8 Collision Core, RG 2.462, diff 0.052Track MC2 Asym Core, RG 2.470, diff 0.046Radical Evil Eye Symmetric Core, RG 2.490, diff 0.046Ebonite Iron Fist V2 Core, RG 2.470, diff 0.053Radical No Doubt Symmetric Core, RG 2.480, diff 0.051Roto 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 2.520, 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 Huntsman Core, RG 2.470, diff 0.050Ebonite 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 Torsion AI Core, RG 2.470, diff 0.050Storm Element Max AI Core, RG 2.470, diff 0.055Roto 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 0.051Epic 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 2.470, diff 0.048Ebonite Entity Core, RG 2.510, diff 0.052Roto Grip Rocker AI Core, RG 2.480, diff 0.050DV8 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 0.036Storm Inverted Fe2 Core, RG 2.570, diff 0.046Storm 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 0.051Columbia 300 Shifter Core, RG 2.470, diff 0.050Radical 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 Supercoil Core, RG 2.470, diff 0.053Storm Centripetal HD A.I. Core, RG 2.460, diff 0.056Hammer Modified Infamous Core, RG 2.560, 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 2.470, 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 0.053Storm Radius Core (pictured: Storm Concept Bowling Ball)1Hammer Super LED Core (pictured: Hammer Purple Pearl Urethane 78D Bowling Ball)2Hammer LED Resin Bowling Ball Core (pictured: Hammer NU 2.0 Hammer Bowling Ball)3Storm Surge Core (pictured: Storm Tropical Surge Pink Purple Bowling Ball)4Motiv Flux Core (pictured: Motiv Shadow Tank Bowling Ball)5Storm Capacitor Core (pictured: Storm Pitch Black Bowling Ball)6Hammer LED Core (pictured: Hammer Purple Pearl Urethane 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 LED Resin Bowling Ball Core Same family: Hammer LED 3.0 Core Same family: Hammer LED 3.0 Low Flare Same family: Hammer LED 2.0 Core

This core 1 Nearest cores Other cores

Nearest cores to the Hammer LED Core
Core Brand Shape RG Diff vs this core
Storm Concept Bowling Ball1Storm Radius CorePictured: Storm Concept
 Storm Symmetric 2.610 0.020 RG −0.040 · Diff +0.005
Hammer Purple Pearl Urethane 78D Bowling Ball2Hammer Super LED CorePictured: Hammer Purple Pearl Urethane 78D
 Hammer Symmetric 2.630 0.034 RG −0.020 · Diff +0.019
Hammer NU 2.0 Hammer Bowling Ball3Hammer LED Resin Bowling Ball CorePictured: Hammer NU 2.0 Hammer
 Hammer Symmetric 2.586 0.027 RG −0.064 · Diff +0.012
Storm Tropical Surge Pink Purple Bowling Ball4Storm Surge CorePictured: Storm Tropical Surge Pink Purple
 Storm Symmetric 2.580 0.024 RG −0.070 · Diff +0.009
Motiv Shadow Tank Bowling Ball5Motiv Flux CorePictured: Motiv Shadow Tank
 Motiv Symmetric 2.570 0.015 RG −0.080 · Diff 0.000
Storm Pitch Black Bowling Ball6Storm Capacitor CorePictured: Storm Pitch Black
 Storm Symmetric 2.570 0.022 RG −0.080 · Diff +0.007

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

Our new LED core design is a modern version of the traditional light bulb shape that was so popular back in the day.  

From Hammer’s description

Questions bowlers ask

What is the RG of the Hammer LED Core?

At 15 lb the Hammer LED Core has an RG of 2.650. It ranges from 2.610 to 2.680 across the listed weights.

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

At 14 lb the RG is 2.680.

What is the differential of the Hammer LED Core?

At 15 lb the differential is 0.015. This is a symmetric core, so mass bias is not applicable.

Which bowling balls use the Hammer LED Core?

Hammer Black Pearl Urethane Bowling Ball, Hammer Purple Pearl Urethane Bowling Ball, Hammer Magenta Urethane Overseas Bowling Ball, Hammer Black Solid Urethane Overseas Bowling Ball. 2 are in stock now.

How do the Hammer LED Core specs change by weight?

At 16 lb: RG 2.610, differential 0.030. At 12 lb: RG 2.628, differential 0.026.

How does the Hammer LED 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 listed on the Purple Pearl Urethane product page, 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

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