Namura (NX-20000R) 53.94mm Diameter Ring Set Fits: NX-10003, NX-20000, NX-20001, NX-20002, NX-20005, NX-30000, NX-30002, NX-40001, and NX-40009 Series Pistons For: Honda CR125 2004-2007; Kawasaki KX 125 1998-2005; KTM 125 SX 2001-2013; Suzuki RM125 1989-2000, 2004-2010; Yamaha YZ125 1997-2014; Husqvarna CR/WR125 1997-2013 Namura uses the best materials matching the ring design to its application, it is one of the most critical factors in their performance Often overlooked and unglamorous, they are an essential part of an engine's efficiency and durability Meets or exceeds OEM specification, only use with Namura Pistons