🚴 IMPROVES PEDALING SPEED BY REDUCING FRICTION: The ceramic inner bearing, specially designed for cycling, has minimal friction that significantly improves performance thanks to a much smoother transmission 🚴 ULTRALIGHT AND RESISTANT: CNC machined with aluminum alloy that ensures maximum strength and durability with the least weight (Ultralight 10g) and a perfect finish. The MTB jockey wheels are anodized in 5 different colors (black, red, blue, gold and silver) to prevent rust and corrosion 🚴 COMPATIBILITY: Compatible with SHIMANO AND SRAM derailleur: shimano jockey wheels 11 speed, shimano jockey wheels 9 speed, sram eagle pulley, derailleur pulley 11 speed, shimano deore, shimano XT, etc... 🚴 INSTALLATION: These derailleur pulley set are very easy to install with an allen key by simply removing the screw that holds the pulley to the derailleur. Make sure the screw is 11,5mm or longer to ensure compatibility (Includes accessory for compatibility with 4mm, 5mm and 6mm screw thickness.). Do not over-tighten because it would increase friction with the rear derailleur reducing the bike jockey wheel performance 🚴 100% GUARANTEE: Customer satisfaction is our priority. If you have any questions, problems or you are not satisfied with the product, please email us and we will help you to solve it as soon as possible IMPALAPRO Bike Set Of 2 Ceramic Jockey Wheels 11t - Derailleur Pulley - Jockey Wheel Shimano - Jockey Wheels 11 Speed - Pulley Sram - Shimano Jockey Wheels