Manufactured by Namura Kit includes piston, rings, pin, clips, top end gasket kit you get exactly what is pictured HyperDryve Series piston The HyperDryve line of pistons is composed of a space-age hypereutectic aluminum alloy developed by NASA. Engineered to maintain its high tensile strength up to 700 F 370 C , 50% higher than a conventional cast piston, this gives HyperDryve pistons the strength to perform under operating conditions normally reserved for forged pistons. Cast piston has super-high silicone content for additional strength Piston skirts are Molybdenium Teflon coated to minimize resistance/wear and provide extended life Piston dome is anodized for superior heat resistance and longer lifespan Namura gaskets use performance materials to increase durability and provide greater reliability Includes all gaskets pictured to rebuild top end Kit is for standard bore size 96.00mm Size A piston is 95.97mm Compression ratio of 12.0 1 Made in Taiwan Fits 2009 Honda CRF450R 2010 Honda CRF450R 2011 Honda CRF450R 2012 Honda CRF450R