Hammer offers flawless performance with the Hammer Flawless mid performance bowling ball. The combination of the Juiced Pearl coverstock and 40 Watt core result in good length and strong backend motion when gliding through medium 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.