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Storm Ion Pro Pearl specs
The Storm Ion Pro Pearl is a pearl reactive ball with the Element Tour AI core. Here are its published specs, how they compare with the other current balls in our table, and what the numbers mean on the lane.
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| Coverstock | NRG Pearl |
|---|---|
| Cover type | Pearl reactive |
| Core (weight block) | Element Tour AI |
| Core type | Asymmetric |
| RG | 2.470 |
| Differential | 0.035 |
| Mass bias / intermediate diff. | 0.013 |
| Factory finish | 4000 Grit |
| Flare potential (maker) | Medium |
| Maker's category | Premier |
| Color | Amethyst Pearl |
| Release date (maker) | 11/06/26 |
| USBC approved | 13 October 2026 |
Numbers as Storm publishes them, checked 21 October 2026. Storm doesn't say which ball weight these numbers are for. Drilling changes how a ball behaves, so a pro shop's layout matters as much as these numbers.
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What the numbers mean
RG 2.470. That is lower than 85% of the 134 current reactive and urethane balls in our table, so it sits on the low side. Storm says "a low RG ball will rev up quickly and roll smoothly."
Differential 0.035. Higher than 18% of the balls in our table. Storm says "a low differential ball tends to have a more predictable, controlled motion."
Pearl reactive cover. Pearl covers skid farther before they hook; bowling.com calls them best on medium to dry lanes, and Storm ties them to dry conditions.
Asymmetric core. Storm says asymmetric balls have "varying RG values along different axes" and more angular motion.
USBC allows an RG from 2.447 to 2.813 inches and a differential of at most 0.060 inches (Equipment Specifications Manual, March 2026). Our ball spec table lists every current ball we track, and who makes bowling balls covers which company owns Storm.
Balls with similar numbers
Same cover type, closest RG and differential in our table:
- Motiv Hyper Venom: RG 2.480, differential 0.034
- Motiv Venom Hysteria: RG 2.480, differential 0.034
- Storm !Q Tour Sapphire: RG 2.490, differential 0.035
- Track Kinetic Sapphire Ice: RG 2.480, differential 0.040
Sources: Storm product page; Storm, "Inside The Bowling Ball"; Storm, "The Coverstock"; bowling.com coverstock FAQ; USBC Approved Ball List (20 October 2026); USBC Equipment Specifications Manual.