Compare the specs of the Roto Grip UFO Alert and Roto Grip Idol Helios 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 | Idol Helios |
| Cover Name | eTrax Hybrid | XtremeTrax Solid Reactive |
| Cover Type | Reactive Hybrid | Reactive Solid |
| Box Finish | 1500 Grit Polished | 2000 Abralon |
| Color | Purple Solid / Emerald / Teal | Radiant Orange |
| Core Name | E.T. (Equalizer Technology) | Ikon |
| Core Type | Asymmetrical | Symmetrical |
| RG | 2.52 | 2.49 |
| Total Diff. | 0.054 | 0.052 |
| Int. Diff. | 0.016 | 0.000 |
Torque Length Back End Total Hook Ball Tester Ratings | Already a premium member? Click here to log in. | |