Moose Racing Cast Aluminum Piston Kit - 71.94mm 0910-5953Gravity cast aluminum alloy with 18% silicon to increase resistance to wear and decrease thermal distortion, thus providing a longer piston life Coated skirts ease break in, decreasing wear, and aiding in lubrication Wear resistant piston rings that are either nitride or chrome plated Wrist pins are nitride coated providing a hardened wear resistant bearing surface Piston rings are compatible with OEM pistons Replacement rings are sold individually