Track Theorem Delta Bowling Ball ITRG89 M This ball combines the QR-9

This ball combines the QR-9 Solid coverstock with the Starship core

Ortholite footbed

while still providing PLENTY of giddy up down lane

wide 5" wheels for a smoother ride

Track Theorem Delta Bowling Ball ITRG89 M This ball combines the QR-9Track 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