These pulley wheels by Elvedes are produced according to the ABEC 3 standard and extra lubricated with grease to improve performance and extend service life. The set of pulley wheels feature sealed bearings. 2 x 10 teeth. Packaged on a hanging card.Includes spacers suitable for:A - Shimano 8 speedB - Shimano 7 speed, Campagnolo 8 speedC - Campagnolo 9 / 10 speedD - SRAM (one hole upper pulley) 9.0SL ('98) / 9.0 ('97 - '98) / 7.0 ('97 - '98) / 5.0 ('98 - '99)"