VertexWinderosa Forged Race Replica Piston Kit Fits Yamaha - 450 ccForged OE Replacement Piston, Race version Forged Race Unique forged GP style race piston with only one compression ring Forged Replica pistons are forged OE replacements. Forged pistons are forged from 2618 aluminum for superior strength and durability. All piston skirts are coated with a high tech coating for faster break in time and increased piston life. All pistons are heat treated with a T 5 hardening and tempering cycle. Kits include piston,