This set of pulley wheels by Elvedes, 2 x 11-tooth, are equipped with rustproof sealed bearings. The pulley wheel bearings meet ABEC 5 standard and are extra lubricated for higher durability and performance. Packed on a hanging card. Bushings included.Suitable for the following derailleurs, among others:Shimano 9 / 10 11 speed & 10 speed GRX MTB & RoadSRAM X0 / X9 / X7 9 speed MTB from 2011 & X0 / X9 / X7 10 speed MTBSRAM Apex / Riva l/ Force 10 speed Road (use a bushing for the 4 mm bolt)Campagnolo 11 speed Road