The Tusk Piston Kit is a direct OEM replacement to your worn out standard OEM piston. Built to OEM specs, the Tusk Piston Kit is cast from a high silcon content aluminum alloy in order to reduce friction within the cylinder and heat treated with a T-6 hardening cycle to provide a durable piston at a lower cost. With a PTFE coating to reduce wear, the Tusk Piston Kit is sure to be a great choice. Don't break the bank when it's time to break into your top end. Look no further than Tusk for high-quality OEM replacement parts.