Manufactured by Namura Kit includes piston, rings, pin, clips, top end gasket kit you get exactly what is pictured 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 big bore size 89.00mm Piston size is 88.95mm Compression ratio of 11 1 Made in Taiwan Fits 1999 Honda TRX400EX Sportrax Big Bore 440cc 2000 Honda TRX400EX Sportrax Big Bore 440cc 2001 Honda TRX400EX Sportrax Big Bore 440cc 2002 Honda TRX400EX Sportrax Big Bore 440cc 2003 Honda TRX400EX Sportrax Big Bore 440cc 2004 Honda TRX400EX Sportrax Big Bore 440cc 2005 Honda TRX400EX Sportrax Big Bore 440cc 2006 Honda TRX400EX Sportrax Big Bore 440cc 2007 Honda TRX400EX Sportrax Big Bore 440cc 2008 Honda TRX400EX Sportrax Big Bore 440cc 2009 Honda TRX400X Sportrax Big Bore 440cc 2012 Honda TRX400X Sportrax Big Bore 440cc 2013 Honda TRX400X Sportrax Big Bore 440cc 2014 Honda TRX400X Sportrax Big Bore 440cc