Non O-Ring Chain & Silver Sprocket 2000-06 Honda Sportrax 300 TRX300EX 13/38 86L 13 Tooth Front Sprocket, 38 Tooth Rear Sprocket and 520-86L Non-O-Ring Chain All Race-Driven sprockets meet or exceed OEM specifications and use hardened S45C steel. Non-O-Ring chain doesn't have o-rings between the links so it is lighter, thinner and has less drag. Fits 2000 2001 2002 2003 2004 2005 2006 Honda TRX300EX TRX 300EX