Storm Concept Bowling Ball Weights:14 lbs. Mens sizes are listed in

Mens sizes are listed in the drop down menu

Coverstock: GB 12

With new color-coordinated molded base and urethane wheels

Coverstock: S70 Hybrid

Storm Concept Bowling Ball Weights:14 lbs. Mens sizes are listed inStorm Concept Bowling Ball The SPI LAB Series introduces the Concept, our next innovative release that reverses the narrative on how core cover combinations are developed for challenging patterns. The ARC Cover has the highest coefficient of friction (COF) values and is right at the USBC limit on oil absorption time. With the Concept, the coverstock acts as both the engine and the tires, while the Radius Weight Block behaves as the traction control,