Red Non O-Ring 96L Chain & Silver Sprocket 13/39 2006-2009 Honda TRX450R 450R 13 Tooth Front Sprocket, 39 Tooth Rear Sprocket and 520-96L Red 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 2006 2007 2008 2009 Honda TRX450R TRX 450R