A Pro Pin bowling ball from SPI Bowling Products (Storm, Roto Grip, and 900 Global) is where the Pin (Core Top) distance from the CG (Center of Gravity) is 6 - 6 1/2" out. Anything more than 6 1/2" would be considered an X-Blem.
This is a premium, first-quality ball crafted to the same exacting standards as the rest of these elite lines - ensuring top-tier performance and durability without any compromises.
Due to changes in the USBC rules for static balances and weight holes, Pro Pins/Pro Cg's no longer have specialized and unique layouts. These balls can be drilled using any of the SPI drilling layouts. NOTE - On Pro CG balls, the final placement of the CG (Center of Gravity) will appear to be in an odd location but this will not affect the ball reaction.
Step your bowling game up in a BIG way with the Tropical Surge!
Storm has re-done one of their most popular bowling balls, the Tropical Breeze/Storm yet again- meet the Tropical Surge. This ball introduces the new Surge symmetric core, made for a stronger yet controllable backend reaction.
The Reactor pearl coverstock finished at 1500-grit polished will provide a controllable read without over-reacting in the backend. Perfect for those bowlers who are ready to make waves on the lanes.
Here is what Storm has to say about the Tropical Surge:
Our beloved Tropical line has evolved again! The all-new Surge Core, with a boosted differential paired with our dependable Reactor formula will give you the curve you've been craving for. Six exciting colors and fragrances will appeal to just about anybody.
