These are Viton o-rings from Schmidty Racing Suspensions used on Fox Podium 2.5" and 3.0" with 7/8" shafts, to go between the steel shock mounting bushings and the shock eyelet bearings.
Will not fit Fox Podium with 5/8" shaft.
Compared to the OEM rings and silicon, these o-rings are made from viton which has a higher durometer (tougher) rating as well as higher petroleum resistance. These do not become soft, swell out, and/or tear like the OEM ones do.
Known to fit Polaris Fox Edition XP1000 3.0" shocks; rear shocks of Can-Am Maverick Fox 2.5" shocks with 7/8" shafts; rear shocks on Yamaha YXZ 1000R; other models.