Manufactured by Namura Kit includes piston, rings, pin, clips, wrist pin bearing 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 .040 over bore size 48.00mm Piston is 47.95mm Compression ratio of 8.2 1 Made in Taiwan Fits 1993 Yamaha YZ80 1994 Yamaha YZ80 1995 Yamaha YZ80 1996 Yamaha YZ80 1997 Yamaha YZ80 1998 Yamaha YZ80 1999 Yamaha YZ80 2000 Yamaha YZ80 2001 Yamaha YZ80