Compare the specs of the Roto Grip UFO Alert and Roto Grip RST X-2 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 | UFO Alert | RST X-2 |
| Cover Name | eTrax Hybrid | eTrax PLUS Pearl |
| Cover Type | Reactive Hybrid | Reactive Pearl |
| Box Finish | 1500 Grit Polished | 1500 Grit Polished |
| Color | Purple Solid / Emerald / Teal | Tanzanite |
| Core Name | E.T. (Equalizer Technology) | RST (Roto Star Tour) |
| Core Type | Asymmetrical | Asymmetrical |
| RG | 2.52 | 2.53 |
| Total Diff. | 0.054 | 0.053 |
| Int. Diff. | 0.016 | 0.016 |
Torque Length Back End Total Hook Ball Tester Ratings | Already a premium member? Click here to log in. | |