Urethane

900 Global Zen Gold Label Bowling Ball Color: Deep Purple Coverstock: S77 Response Pearl  Weight Block: Meditate Symmetric Factory Finish: Reacta Gloss Flare Potential: High Radius of Gyration (RG): 16lbs - 2.48;...

Roto Grip Spare Tire Bowling Ball - 15lbs Only Color: Charcoal Coverstock: High-Impact Pearl Urethane Weight Block: 3-Piece Core Factory Finish: 3500 Grit Polished Flare Potential: Low Radius of Gyration (RG): 2.69 Differential...