Hammer wants you to be ruthless to your competition with their Hammer Ruthless mid performance bowling ball. The combination of the Juiced Solid coverstock and 40 Watt core result in good overall ball motion with a strong reaction at the 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.