Best Bowling Balls For Hook 2021Motiv Purple Tank (1-hand and 2-hand) by TamerBowling.com March 30, 2021 - by - 9 Comments. We finally get our hands on the Motiv Purple Tank Bowling Ball. This continues the big urethane trend with a strong urethane reaction. How close is this to the Purple Hammer?? Thanks to Limerick Bowl, Limerick PA.