Non O-Ring 88L Chain and Sprocket 12/42 fits 1995-1998 Polaris 250 Trail Blazer Sprocket Set includes: 12T, 42T sprockets and 520-88L 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 1995 1996 1997 1998 Polaris 250 Trail Blazer