Compare bowling balls
Core numbers are compared in one weight. Some brands only publish them for one weight.
Hammer Black Widow 2.0
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Hammer Black Widow 3.0 Dynasty
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Hammer Black Widow 3.0
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Roto Grip Perfect Gem
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|---|---|---|---|---|
| Brand | Hammer | Hammer | Hammer | Roto Grip |
| Line | Upper Mid | Upper Mid | Upper Mid | HP4 |
| Coverstock | Aggression Solid | HK22 - Cohesion Solid | HK22 - Aggression Solid | ER1 Solid |
| Cover type | Solid reactive | Solid reactive | Solid reactive | Solid reactive |
| Core | Gas Mask | Gas Mask | Gas Mask | Gem AI |
| Core type | Asymmetric | Asymmetric | Asymmetric | Asymmetric |
| RG | 2.500 | 2.500 | 2.500 | 2.490 (16 lb) |
| Diff | 0.058 | 0.058 | 0.058 | 0.055 (16 lb) |
| Int. diff | 0.016 | 0.016 | 0.016 | 0.017 |
| Factory finish | 500, 1000, 2000 Siaair Micro Pad | 500, 1000, 2000 Siaair Micro Pad | 500, 1000, 2000 Siaair Micro Pad | 2000 Grit |
| Lane condition | Medium oil – Heavy oil | Medium oil – Heavy oil | Medium oil – Heavy oil | — |
| Flare potential | — | — | — | High |
| Reaction | Aggressive backend | Aggressive mid-lane and backend | Aggressive backend | — |
| Color | Black / Red | Ultraviolet / Black | Black / Orange | Pink / Rose / Onyx |
| Release date | November 19, 2020 | January 15, 2026 | January 25, 2024 | October 2, 2026 |
| Status | Retired | Current | Current | Current |
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