The MOTIV QZ1 will scorch the competition on medium oil with the new Quadfire inner core and new MOTIVator Z reactive urethane cover. Quadfire Inner CoreThe new Quadfire inner core produces an RG that stores energy for the backend reaction and a differential for controlled track flare. The 15 ball has an RG rating of 2.55 and differential of .043. MOTIVator Z Reactive UrethaneThe shell on the QZ1 Quadfire is our new MOTIVator Z reactive urethane. The Purple Pearl QZ1 is 1000 wet sanded and then polished with Power Gel. This gives the Purple Pearl ball a slightly earlier read on the lane than the Red Pearl ball. ReverbOuter CoreThe Reverb outer core of the QZ1 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. NeoMark Reactive Urethane Graphics The Purple Pearl QZ1 coverstock is integrated with Silver Pearl NeoMark logo graphics. These graphics are also formulated from MOTIVator Z reactive urethane so you have a consistent reaction 360 around the ball surface. Product Type Bowling Balls