Compare bowling balls
Core numbers are compared in one weight. Some brands only publish them for one weight.
Hammer Black Widow Ghost Pearl
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Hammer Black Widow Mania
|
Roto Grip Transform Pearl
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Roto Grip RST Hyperdrive Pearl
|
|
|---|---|---|---|---|
| Brand | Hammer | Hammer | Roto Grip | Roto Grip |
| Line | Upper Mid | Upper Mid | HP5 | HP4 |
| Coverstock | Aggression Pearl | HK22 - Cohesion Pearl | Microtrax Pearl | U-R1 Pearl |
| Cover type | Pearl reactive | Pearl reactive | Pearl reactive | Pearl reactive |
| Core | Gas Mask | Gas Mask | Morph Wing | RST AI |
| Core type | Asymmetric | Asymmetric | Asymmetric | Asymmetric |
| RG | 2.500 | 2.500 | 2.500 (16 lb) | 2.510 (16 lb) |
| Diff | 0.058 | 0.058 | 0.050 (16 lb) | 0.051 (16 lb) |
| Int. diff | 0.016 | 0.016 | 0.015 | 0.016 |
| Factory finish | 500, 1000, 1500 Siaair / Crown Factory Compound | 500, 1000, 1500 Siaair / Factory Compound | Power Edge | Power Edge |
| Lane condition | Medium oil – Heavy oil | Medium oil – Heavy oil | — | — |
| Flare potential | — | — | High | High |
| Reaction | Aggressive midlane and backend | Length with aggressive backend | — | — |
| Color | White | Cobalt / Black | Red / Cherry / Shadow | Space Blue / Deep Purple |
| Release date | November 19, 2021 | January 16, 2025 | July 10, 2026 | September 19, 2025 |
| Status | Retired | Current | Current | Current |
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