Motiv Sigma Bowling Ball Core
The science behind the vicious attack on the pins is the Sigma™ inner core. It has been precisely engineered to deliver an RG of 2.47 with a differential of .047 (15# ball).
The Reverb™ outer core of the Sigma is a low-density polyester resin with pin piercing hardness and strength. Rather than absorb impact energy, this outer core reverberates energy as it explodes through the pins.