The Hammer Diesel is back and with more torque! The Hammer Diesel Torque bowling ball has the same popular Diesel core as the original but this time it is wrapped in Hammer's Juiced Solid coverstock. This core and cover combo offer a strong mid-lane reaction with continuous backend on medium to heavy oil conditions. 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.