Compare bowling balls
Core numbers are compared in one weight. Some brands only publish them for one weight.
Roto Grip Perfect Gem
|
|
|---|---|
| Brand | Roto Grip |
| Line | HP4 |
| Coverstock | ER1 Solid |
| Cover type | Solid reactive |
| Core | Gem AI |
| Core type | Asymmetric |
| RG | 2.490 (16 lb) |
| Diff | 0.055 (16 lb) |
| Int. diff | 0.017 |
| Factory finish | 2000 Grit |
| Lane condition | — |
| Flare potential | High |
| Reaction | — |
| Color | Pink / Rose / Onyx |
| Release date | October 2, 2026 |
| Status | Current |
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