Pro-Race – Forged piston developed with Vertex technology and race shape profileAll pistons are heat-treated with a T-5 hardening and tempering cycleAll piston skirts are coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston lifeForged pistons are forged from 2618 aluminum for superior strength and durabilityKits include piston, rings, wrist pin and circlipsReplacement two-stroke piston rings sold individually four stroke piston rings sold as a set