Compare bowling balls
Core numbers are compared in one weight. Some brands only publish them for one weight.
Roto Grip Jester Clear Polyester
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Roto Grip Cosmos
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Hammer Black Pearl Urethane
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Hammer Purple Pearl Urethane
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|---|---|---|---|---|
| Brand | Roto Grip | Roto Grip | Hammer | Hammer |
| Line | EP | EP | Mid | Mid |
| Coverstock | Clear Poly | Clear Poly | Urethane Pearl 78D | Urethane Pearl |
| Cover type | Polyester | Polyester | Urethane | Urethane |
| Core | 3 Piece | 3 Piece | LED | LED |
| Core type | Symmetric | Symmetric | Symmetric | Symmetric |
| RG | 2.690 (16 lb) | 2.680 (16 lb) | 2.650 | 2.650 |
| Diff | 0.006 (16 lb) | 0.006 (16 lb) | 0.015 | 0.015 |
| Int. diff | — | — | — | — |
| Factory finish | 3500 Grit Polished | 3500 Grit Polished | 500 Siaair Micro Pad | 500, 1000, 2000 Siaair Micro Pad |
| Lane condition | — | — | Light oil | Light oil – Medium oil |
| Flare potential | Low | Low | — | — |
| Reaction | — | — | Smooth arc | Smooth Arc |
| Color | Bichrome-Black / Red | Sky / Admiral / Teal | Black Pearl | Purple Pearl |
| Release date | October 18, 2024 | July 17, 2026 | March 21, 2024 | July 1, 2021 |
| Status | Current | Current | Current | Current |
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