Reaction: Strong mid-lane and powerful backend

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

This line of bowling balls balances power and control by pairing the R-16 reactive coverstock and a light bulb-shaped core

The Cyclone Torque core is surrounded by a GB 11

Columbia 300 Dynamic Swing Bowling Ball Select Weight:16 lbs. Reaction: Strong mid-lane and powerfulColumbia 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,