Knock down strikes and work toward that perfect 300 game with the Storm Virtual Gravity (15 pounds) Bowling Ball. The matte finish and heavy lane condition ensures that this ball glides down the alley to strike the pins down. It features an asymmetric core type, a durometer of 73-75, and a perfect scale of 219.5. Take your bowling game to the next level with this pro performance bowling ball that has a 6-inch + high flare potential, a differential of 0.052, and RG of 2.48, and easy grip holes that ensure that the bowl stays in the hand until released.