These derailleur wheels 2 x 11 teeth from Elvedes feature standard sealed bearings. The derailleur wheel bearings are ABEC 3 compliant and extra greased for higher durability and performance. The box contains 10 sets.Includes spacers, suitable for:A - Shimano 8 / 9 / 10 / 11 speed & 10 speed GRXB - Shimano 7 speed, Campagnolo 8 speedC - Campagnolo 9 / 10 speedD - SRAM 7.0 / 9.0 ('97 - '99)" "