Bowling ball core · Brunswick

Brunswick Danger Zone Core

Symmetric Brunswick core

A symmetric core with mid-lane rev-up and medium flare, built for medium to heavy oil. 2 of the 2 balls with this core are in stock at BowlersMart.

  • Symmetric
  • RG 2.501
  • Diff 0.048
Brunswick Danger Zone symmetric core shape inside the ball

Specs

RG AT 15 LB

2.501

Mid-lane rev-up

Revs soonerRevs later

52% of the reactive and urethane balls we stock have a lower RG.

DIFFERENTIAL AT 15 LB

0.048

Medium flare

Less flareMore flare

55% 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.
Brunswick Danger Zone Core specs by ball weight (reference ball: Brunswick Danger Zone Purple Ice)
Weight RG DifferentialDiff Mass biasMB
16 lb 2.488 0.048 None
15 lbUsed on this page 2.501 0.048 None
14 lb 2.518 0.048 None
13 lb 2.574 0.040 None
12 lb 2.597 0.040 None
11 lb 2.769 0.002 None
10 lb 2.800 0.002 None

Source: Brunswick published specs, as listed on the Danger Zone Purple Ice 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 Brunswick Danger Zone Core

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

Pearl covers

Pearl covers go longer and turn harder at the end, best on medium oil.

Brunswick Danger Zone Purple Ice Bowling Ball

Brunswick Danger Zone Purple Ice

Brunswick HK22 PowerKoil Pearl Reactive

Medium to heavy oil

Sale price $119.95 Regular price $199.95In stock

Reactive covers

Reactive covers whose finish is not listed in our catalog.

Brunswick Danger Zone Bowling Ball

Brunswick Danger Zone

Brunswick HK22 PowerKoil 26 Reactive

Medium to heavy oil

Sale price $119.95 Regular price $199.95In stock

Shop the 2 available balls with this core

Where the Brunswick Danger Zone sits

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

Storm Element Tour A.I. Core, RG 2.470, diff 0.035DV8 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 2.508, 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 Core, 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 2.517, diff 0.040Ebonite Centrex Symmetrical Mass Bias Core, RG 2.466, diff 0.056Motiv Excel Core, RG 2.550, diff 0.030Motiv Detonator Core, RG 2.470, diff 0.055Storm Solarion A.I. Core, RG 2.480, diff 0.054SWAG Insanity Symmetric Core, RG 2.520, diff 0.034SWAG Fusion Core, RG 2.540, diff 0.036SWAG Dragon Asymmetric Core, RG 2.490, diff 0.050SWAG 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 0.051DV8 Collision Core, RG 2.462, diff 0.052Track MC2 Asym Core, RG 2.473, diff 0.046Ebonite Iron Fist V2 Core, RG 2.473, diff 0.053Radical No Doubt Symmetric Core, RG 2.485, 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 A.I. Core, RG 2.470, diff 0.055900 Global Strobe A.I. Core, RG 2.510, diff 0.052Radical Guru Core, RG 2.503, diff 0.044Track I-CORE 3.0, RG 2.486, diff 0.056DV8 Unholy Core, RG 2.504, diff 0.051Brunswick Infinity Core, RG 2.521, diff 0.051Storm Catalyst A.I. Core, RG 2.480, diff 0.053Hammer 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 2.480, diff 0.040Brunswick Light Bulb Core, RG 2.524, diff 0.030Radical Sneak Attack Core, RG 2.544, diff 0.036Motiv Gear Core, RG 2.480, diff 0.034Hammer Huntsman Core, RG 2.470, diff 0.050Hammer Super LED Core, RG 2.632, diff 0.034Ebonite Enhanced V2 Core, RG 2.480, diff 0.048DV8 Dualistic Core, RG 2.496, diff 0.045Radical Vexed Asymmetric Core, RG 2.498, diff 0.036Motiv Quadfire Core, RG 2.550, diff 0.043Track Stealth Core, RG 2.482, diff 0.056Brunswick Tiered Hexagon Core, RG 2.540, diff 0.045Columbia 300 Piranha Core, RG 2.554, diff 0.043Storm Torsion A.I. Core, RG 2.470, diff 0.050Storm Element Max A.I. 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 Craze Core, RG 2.520, diff 0.030SWAG Serpent Asymmetric Core, RG 2.510, diff 0.048Radical Torpedo Asymmetric Core, RG 2.480, diff 0.052Motiv Overload Core, 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 Core, RG 2.499, diff 0.051Motiv Apex Predator Core, RG 2.520, diff 0.055Storm RAD-TQ Core, RG 2.560, diff 0.051Storm Velocity Core, RG 2.480, diff 0.051Hammer Modified LED Core, RG 2.586, diff 0.027Epic Spark Core, RG 2.540, diff 0.049Motiv Hadron Dual Density Core, RG 2.500, diff 0.045Brunswick Zone Asymmetric Core, RG 2.478, diff 0.048Ebonite Entity Core, RG 2.515, diff 0.052Roto Grip Rocker A.I. Core, RG 2.480, diff 0.050Motiv Flux Core, RG 2.570, diff 0.015Hammer Gas Mask Low Diff Core, RG 2.500, diff 0.034Roto Grip RST A.I. Core, RG 2.520, diff 0.055Motiv Impulse V2 Core, RG 2.550, diff 0.050SWAG APX V1 Core, RG 2.500, diff 0.042SWAG Judge Core, RG 2.490, diff 0.052900 Global Magna A.I. Core, RG 2.490, diff 0.044Columbia 300 Pulse PowerCOR Core, RG 2.468, diff 0.045KR Strikeforce 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 A.I. Core, RG 2.480, diff 0.031Motiv Gear APG Core, RG 2.470, diff 0.036Radical Snapshot Symmetric Core, RG 2.523, 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 0.022DV8 Mantra Core (pictured: DV8 Mantra Solid Bowling Ball)1Track Criterion ID Core (pictured: Track Criterion Inverse Bowling Ball)2Hammer Gauntlet Core (pictured: Hammer Spawn Bowling Ball)3SWAG Watcher Symmetric Core (pictured: SWAG Unknown Solid Bowling Ball)4Radical Evil Eye Symmetric Core (pictured: Radical Evil Eye Bowling Ball)5SWAG Unreal Core (pictured: SWAG Unreal Bowling Ball)6Brunswick Danger Zone Core (pictured: Brunswick Danger Zone 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.

This core 1 Nearest cores Other cores

Nearest cores to the Brunswick Danger Zone Core
Core Brand Shape RG Diff vs this core
DV8 Mantra Solid Bowling Ball1DV8 Mantra CorePictured: DV8 Mantra Solid
 DV8 Asymmetric 2.498 0.047 RG −0.003 · Diff −0.001
Track Criterion Inverse Bowling Ball2Track Criterion ID CorePictured: Track Criterion Inverse
 Track Asymmetric 2.496 0.047 RG −0.005 · Diff −0.001
Hammer Spawn Bowling Ball3Hammer Gauntlet CorePictured: Hammer Spawn
 Hammer Asymmetric 2.501 0.050 RG 0.000 · Diff +0.002
SWAG Unknown Solid Bowling Ball4SWAG Watcher Symmetric CorePictured: SWAG Unknown Solid
 SWAG Symmetric 2.510 0.048 RG +0.009 · Diff 0.000
Radical Evil Eye Bowling Ball5Radical Evil Eye Symmetric CorePictured: Radical Evil Eye
 Radical Symmetric 2.495 0.046 RG −0.006 · Diff −0.002
SWAG Unreal Bowling Ball6SWAG Unreal CorePictured: SWAG Unreal
 SWAG Symmetric 2.510 0.047 RG +0.009 · Diff −0.001

Matches use 15 lb RG and differential.

Drilling and tools

Brunswick drill sheetsLayout guides for symmetric and asymmetric ballsDual angle converterTurn a pin to PAP layout into a dual angle layout

Turn on JavaScript to compare with your ball.Balls with the Brunswick Danger Zone Core2 of the 2 balls with the Brunswick Danger Zone Core are in stock at BowlersMart. Same core, different covers: pick the cover for the lanes you bowl on.Pearl coversPearl covers go longer and turn harder at the end, best on medium oil.

From Brunswick’s description

Questions bowlers ask

What is the RG of the Brunswick Danger Zone Core?

At 15 lb the Brunswick Danger Zone Core has an RG of 2.501. It ranges from 2.488 to 2.800 across the listed weights.

What is the 14 lb RG of the Brunswick Danger Zone Core?

At 14 lb the RG is 2.518.

What is the differential of the Brunswick Danger Zone Core?

At 15 lb the differential is 0.048. This is a symmetric core, so mass bias is not applicable.

Which bowling balls use the Brunswick Danger Zone Core?

Brunswick Danger Zone Bowling Ball, Brunswick Danger Zone Purple Ice Bowling Ball. 2 are in stock now.

How do the Brunswick Danger Zone Core specs change by weight?

At 16 lb: RG 2.488, differential 0.048. At 12 lb: RG 2.597, differential 0.040.

How does the Brunswick Danger Zone 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. Brunswick published specs, as listed on the Danger Zone Purple Ice product page, as published by the manufacturer.

Baseline. The baseline is 212 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.

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