Compare the specs of the Roto Grip RST X-1 and Roto Grip UFO Alert side by side in the ball comparison table below. To view the full bowling ball review for one of these balls, click the ball name link in the table below.
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| Brand | Roto Grip | Roto Grip |
| Ball Name | RST X-1 | UFO Alert |
| Cover Name | MicroTrax Hybrid | eTrax Hybrid |
| Cover Type | Reactive Hybrid | Reactive Hybrid |
| Box Finish | 3000 Abralon | 1500 Grit Polished |
| Color | Black / Dark Forest / Forest Pearl | Purple Solid / Emerald / Teal |
| Core Name | RST (Roto Star Tour) | E.T. (Equalizer Technology) |
| Core Type | Asymmetrical | Asymmetrical |
| RG | 2.53 | 2.52 |
| Total Diff. | 0.053 | 0.054 |
| Int. Diff. | 0.016 | 0.016 |
Torque Length Back End Total Hook Ball Tester Ratings | Already a premium member? Click here to log in. | |