C-BEAR OCM Shimano 11-speed/Ultegra 12-speed Full Ceramic Derailleur Pulleys

The OCM Full Ceramic Shimano derailleur pulleys from C-BEAR work with ceramic ball bearings that run in ceramic grooves. They are compatible with the 11-speed rear derailleurs of the Dura-Ace R9100, Ultegra R8000 and 105 R7000 series as well as with the Ul