The Hammer Web bowling ball takes the highly sucessful Aggression Hybrid coverstock and pairs it with the ever popular Spheroid core. This combination allows the ball to have a strong mid lane reaction and then gives a heavy roll off the backend when the lanes have a medium to heavy oil condition. 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.