Compare bowling balls
Core numbers are compared in one weight. Some brands only publish them for one weight.
Brunswick Mastermind Strategy
|
Hammer Spawn
|
Roto Grip Transformer
|
Roto Grip Wicked Gremlin
|
|
|---|---|---|---|---|
| Brand | Brunswick | Hammer | Roto Grip | Roto Grip |
| Line | Pro | High | HP5 | HP3 |
| Coverstock | Relativity Solid | HK22C² Solid | VR1 Solid | GR1 Solid |
| Cover type | Solid reactive | Solid reactive | Solid reactive | Solid reactive |
| Core | Modified Mastermind Asymmetric | Gauntlet | Morph Wing | Rondure MaxD |
| Core type | Asymmetric | Asymmetric | Asymmetric | Asymmetric |
| RG | 2.504 | 2.501 | 2.500 (16 lb) | 2.500 (16 lb) |
| Diff | 0.048 | 0.050 | 0.050 (16 lb) | 0.056 (16 lb) |
| Int. diff | 0.013 | 0.012 | 0.015 | 0.011 |
| Factory finish | 500, 2000 Siaair Micro Pad | 500, 1000 Siaair Micro Pad | 4000 Grit | 2000 Grit |
| Lane condition | — | Medium oil – Heavy oil | — | — |
| Flare potential | — | — | High | High |
| Reaction | — | Strong overall hook | — | — |
| Color | Blue / Violet / Orange | Black | Indigo / Violet / Slate | Citrine / Red / Purple |
| Release date | — | May 14, 2026 | January 23, 2026 | August 7, 2026 |
| Status | Retired | Current | Current | Current |
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