Manufactured by Namura HyperDryve Series piston Kit includes piston, rings, pin, clips you get exactly what is pictured 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 Kit is for standard bore size 95.00mm Size A piston is 94.95mm Made in Taiwan Fits 2004 Yamaha YFZ450 2005 Yamaha YFZ450 2006 Yamaha YFZ450 2007 Yamaha YFZ450 2008 Yamaha YFZ450 2009 Yamaha YFZ450 2009 Yamaha YFZ450R 2010 Yamaha YFZ450R 2010 Yamaha YFZ450X 2011 Yamaha YFZ450R 2011 Yamaha YFZ450X 2012 Yamaha YFZ450 2012 Yamaha YFZ450R 2013 Yamaha YFZ450 2013 Yamaha YFZ450R 2014 Yamaha YFZ450R 2015 Yamaha YFZ450R 2016 Yamaha YFZ450R 2017 Yamaha YFZ450R