This Rebel is ready to yell! The Hammer Rebel Yell features the Rebel core covered with the Juiced Pearl coverstock and is finished out of the box with a 500 then 2000 grit Abralon pad and then polished with Powerhouse Factory Finish Polish. This combination produces a lot of downlane angle when up against medium oil conditions giving you length with a strong backend. This bowling ball is Carbon Fiber Infused! Carbon fiber is one of the toughest materials on earth. Hammer decided to add this material to the inner core of this ball for added strength and durability allowing them to offer an incredible 3 year warranty.