ARE YOU UP TO THE CHALLENGE(R)?Get hooked on the brand new reactive ball from PROBOWL. This ball is great to get into bowling and for advanced bowlers to blend out the lane with a little bit more surface.Tech Specs:- Color: Dark blue / Light blue Pearl- Weightblock: Challenger core- Coverstock: Conquering Pearl- Finish: 500 grit / Factory compound / Factory Polish- Weights: 10 - 15 Lbs- Performance: Entry levelSpecifications by Weight:- 15 lbs: RG 2.59, Diff .018- 14 lbs: RG 2.63, Diff .018- 13 lbs: RG 2.63, Diff .020- 12 lbs: RG 2.62, Diff .020- 11 lbs: RG 2.77, Diff .002- 10 lbs: RG 2.80, Diff .002