ceramicspeed-sram-11-speed-pulley-wheel-set-ceramic-bearing-alloy-pulley-gold
ceramicspeed-sram-11-speed-pulley-wheel-set-ceramic-bearing-alloy-pulley-gold, 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