CP Pistons CPK KIT TRX450R 04-05 12:1 CPK2035 Each piston is forged from 2618-t6 aluminum to ensure maximum strength, durability and performance u Each piston has been developed, tested and raced by championship winning professionals, enabling cp Full radius crown designs maximize quench while eliminating hot spots Cpk kits come with a piston, proprietary treated wrist pin, circlips, rings and cometic top end gask Proprietary treated wrist pins eliminate pin galling while reducing friction and increasing durabili