ceramicspeed-pulley-wheels-for-shimano-xt-xtr-11-speed-11-tooth-alloy-black
ceramicspeed-pulley-wheels-for-shimano-xt-xtr-11-speed-11-tooth-alloy-black, CeramicSpeed pulley wheels reduce friction, last 3-5 time longer than stock high-end pulleys, and are designed to work with less drag.Premium Grade 3 Silicon Nitride Ceramic ballsHand built in Denmark