Manufactured by Namura Kit includes piston, rings, pin, clips 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 Kit is for standard bore size 100.00mm Piston is 99.97mm 9.2 1 Standard compression ratio Made in Taiwan Fits 2001 Yamaha Raptor 660 YFM660R 2002 Yamaha Grizzly 660 4x4 YFM660F 2002 Yamaha Raptor 660 YFM660R 2003 Yamaha Grizzly 660 4x4 YFM660F 2003 Yamaha Raptor 660 YFM660R 2004 Yamaha Grizzly 660 4x4 YFM660F 2004 Yamaha Raptor 660 YFM660R 2004 Yamaha Rhino 660 YXR660F 2005 Yamaha Grizzly 660 4x4 YFM660F 2005 Yamaha Raptor 660 YFM660R 2005 Yamaha Rhino 660 YXR660F 2006 Yamaha Grizzly 660 4x4 YFM660F 2006 Yamaha Rhino 660 YXR660F 2007 Yamaha Grizzly 660 4x4 YFM660F 2007 Yamaha Rhino 660 YXR660F 2008 Yamaha Grizzly 660 4x4 YFM660F