It's pretty hard to up the ante on SRAM's excellent Eagle groupset, but if you're looking for every possible advantage on race day, CeramicSpeed allows you to hot rod your stock rear derailleur with precise shifting, supremely durable, and smoother spinning jockey wheels. These 14-tooth replacement pulleys easily install into your existing Eagle derailleur and provide a claimed 34. 4% improved efficiency with its unique narrow-wide design and of course, those famous spinning CeramicSpeed bearings. Update to some SRAM Eagle 12 Speed Aluminum Pulley Wheels today and go that much quicker on race day. The Eagle 14 Pulley Wheels are hand assembled in Denmark and designed to replicate the narrow-wide 14 tooth top and bottom pulleys that come stock on the derailleur so shifting is just as precise as stock. Durable materials ensure longer life over stock and CeramicSpeed specs a stainless steel bearing race for higher corrosion resistance and more durability in the dirtier riding conditions you're more likely to face while riding off-road.