Best Bowling Balls For Hook 2021Bangin Thane with this Roto Grip Rubicon UC3 November 13, 2021 - by - 16 Comments. This Roto Grip Rubicon UC3 is a different type of urethane bowling ball! This ball has the potential to be a VERY special bowling ball!! Full review drops on Sunday! Also UC3 vs Purple Hammer comparison coming soon!