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 .020 over bore size 39.50mm Piston is 39.48mm 10.0 1 STD Compression Ratio Made in Taiwan Fits 1979 Honda Z50R 1980 Honda Z50R 1981 Honda Z50R 1982 Honda Z50R 1983 Honda Z50R 1984 Honda Z50R 1985 Honda Z50R 1986 Honda Z50R 1987 Honda Z50R 1988 Honda Z50R 1989 Honda Z50R 1991 Honda Z50R 1992 Honda Z50R 1993 Honda Z50R 1994 Honda Z50R 1995 Honda Z50R 1996 Honda Z50R 1997 Honda Z50R 1998 Honda Z50R 1999 Honda Z50R 2000 Honda XR50R 2001 Honda XR50R 2002 Honda XR50R 2003 Honda XR50R 2004 Honda CRF50F 2005 Honda CRF50F 2006 Honda CRF50F 2007 Honda CRF50F 2008 Honda CRF50F 2009 Honda CRF50F 2011 Honda CRF50F 2012 Honda CRF50F 2013 Honda CRF50F 2014 Honda CRF50F 2015 Honda CRF50F 2016 Honda CRF50F