The Hammer Rip'D Pearl combines the greatest qualities of its two predesessor balls. the Agression Pearl CFI coverstock and 3-step 3000 grit finish help get this bowling ball throught he front part of the lane easily and it is able to read the mid lane as well as offer 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.