This set of pulley wheels with 2 x 11 teeth come with sealed bearings as standard. The pulley wheels are extra lubricated for better performance and extended life and meet ABEC 3 standard. Neatly packed on a hanging card.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)" "