CDJ 11T Pulley Set for R8150/R7150/R7100 (Hybrid Ceramic)

*For Shimano R8150/R7150/R7100 (12 speed). Cannot be used for R92 series. *The rear derailleur body is not included with this product. *The retainers (aluminum spacers) on both sides of the bearing have different thicknesses in red and black. Be sure to set it in the correct position before use. Replacement part for SHIMANO R8150/R7150/R7100 (12 speed), compatible with genuine 11T pulley. Adopts special resin (CH10 POM + CF10) containing 10% carbon fiber for excellent durability and quietness. The genuine upper and lower pulleys (SHIMANO R8000) are 22g, while the pulley set is lighter at 18g. The bearings are equipped with ceramic balls and rotate smoothly from low to high rotations.