The Velcro closure makes them ideal for quick on-and-off wear

This core boasts the lowest differential in the new No-Thumb category

Hook Potential: Aggressive overall hook

KR Strikeforce Bowling Thumb Sock

BOWLING BALL CORE SHAPE: Symmetrical Core

Track Theorem Delta Bowling Ball Weights:13 lbs. The Velcro closure makes themTrack Theorem Delta Bowling Ball The Track Theorem Delta builds on the legacy of one of Tracks most trusted performers by enhancing the benchmark motion that made the original so successful. It delivers the same strong midlane read and smooth, sweeping shape while adding a sharper response to friction for increased backend motion and continuation. Compared to the original Theorem, the Delta is more responsive downlane without sacrificing