For Shimano M9000 / M9050 / M8000 / M8050 / M7000 use - KCNC Wheel Bearings reduce friction, which gives you a lower rolling resistance. - Upgrading your wheel bearings to oversized pulley will maximize the return you get from your energy. - KCNC oversized pulley cage reduce friction and increases resistance to contamination and corrosion. - Coated bearings prolong the lifetime even further. - The system consists of Top 14t & Bottom 16t alloy pulley wheels fitted with low friction bearings and a lightweight cage made from 7075 Alloy. - The Oversized Pully Wheel System reduces friction in the pulleys by 45 % and for your optimised performance. - The system is compatible with Shimano XTR M9000/M9050 , XT M8000/M8050 ,SLX M7000 11s rear derailleur. - Top Pulley :14T sealed bearing - Bottom Pulley :16T sealed bearing - Pulley color: Red (as pic. shown) - Cage Material : 7075 Alloy - Weight : approx. 60g - OEM package (This item is exactly as pictured and does not include retail package) Content: 1 pc / pack