Take aim and fire with Hammer Deadly Aim bowling ball. This ball is tough! Hammer used a new core system for this ball that is a Flex-Resin poured Dead Center core. This system positions a super-dense mass close to the center of the ball which generates better energy flow through the bowling ball. The outer core includes Carbon-Fiber (talk about durable!). The Carbon-Fiber creates massive energy recold when the ball hits the pins. Because of this durable outer core Hammer is including an unheard of 3-year Manufacturer's Warranty on the Hammer Deadly Aim bowling ball.