1999-2004 Honda 400EX TRX400EX Non O-Ring Chain & Silver Sprocket 15/38 94L 15 Tooth Front Sprocket, 38 Tooth Rear Sprocket and 520-94L 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 1999 2000 2001 2002 2003 2004 Honda 400 Sportrax TRX400EX