Manufactured by Includes one compression ring Sold per piston. If you are replacing rings on more than one piston please change quantity in the listing Ring is interchangeable with OEM piston unless noted Ring is for standard bore size – 39.50mm Compatible with KTM models below: 2002 50 Jr Adventure 2002 50 Mini Adventure 2002 50 Sr Adventure 2002 50 SX Pro Jr L/C 2002 50 SX Pro Sr L/C 2003 50 Jr Adventure 2003 50 Mini Adventure 2003 50 Sr Adventure 2003 50 SX Pro Jr L/C 2003 50 SX Pro Sr L/C 2004 50 Mini Adventure 2004 50 Sr Adventure 2004 50 SX Pro Jr L/C 2004 50 SX Pro Sr L/C 2005 50 Mini Adventure 2005 50 Sr Adventure 2005 50 SX Pro Jr L/C 2005 50 SX Pro Sr L/C 2006 50 Mini Adventure 2006 50 Sr Adventure 2006 50 SX 2006 50 SX Junior 2007 50 Mini Adventure 2007 50 Sr Adventure 2007 50 SX 2007 50 SX Junior 2008 50 SX 2008 50 SX Junior 2008 50 SX Mini 2009 50 SX 2010 50 SX 2011 50 SX 2012 50 SX 2013 50 SX 2014 50 SX 2015 50 SX 2016 50 SX