2000 Polaris 325 Trail Boss 325 O-Ring Chain and Sprocket Set 11/42 520-82L 11 Tooth Front Sprocket, 42 Tooth Rear Sprocket and 520-82L O-Ring Chain All Race-Driven sprockets meet or exceed OEM specifications and use hardened S45C steel. O-Ring Chain helps keep the pins lubricated which reduces friction and helps the chain last longer. Fits 2000 Polaris Trail Boss 325