Non O-Ring 78L Chain and Sprocket Set 11/38 fits 2000 Polaris 250 Trail Blazer Sprocket Set includes: 11T, 38T sprockets and 520-78L 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 Polaris 250 Trail Blazer