Mt Zoom 13 teeth premium ceramic bearing jockey wheels / pulleys for Shimano 12 speed derailleurs. The lower jockey wheel is the one with the lip/flange. Compatible with the following 12 speed rear derailleurs: Shimano Deore M6100, SLX M7100, SLX M7120, XT M8100, XT M8120, XTR M9100, XTR M9120, plus the following 11 speed rear derailleurs - Shimano Deore M5100, XT M8130.
