The R&D team at Roto Grip worked hard to formulate the purest and most responsive version of the eTrax hybrid coverstock so far

250 piece roll

Reaction: Strong mid-lane and powerful backend

You can carry your gear with a comfortable strap

cell phones

Columbia 300 Dynamic Swing Bowling Ball Select Weight:16 lbs. The R&D team at RotoColumbia 300 Dynamic Swing Columbia 300 is introducing the Dynamic Swing Hybrid by bringing back a modified version of the Full Swing core. They paired this popular core with the ERT Hybrid coverstock with a dull finish to dominate medium to heavy oil conditions and provide a strong midlane and backend reaction. Color: Black Caramel White All colors do vary somewhat from the picture shown Core: Modified Full Swing Coverstock: ERT Hybrid Finish: 500,