Race – Cast 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 lifeCast piston kits are gravity cast aluminum alloy (not forged) with 18% silicone content, which produces an extremely light but very strong pistonKits include piston, rings, wrist pin and circlipsReplacement two-stroke piston rings sold individually four stroke piston rings sold as a set