Improve the performance of your Shimano 11-speed rear derailleur with pulleys that reduce friction and increase bearing life. Ours are designed to operate with less friction, adding power transmitted to the rear wheel. Choices are available to best meet your needs. CNC-machined aluminum pulleys with our Standard Bearings, which consist of our standard CeramicSpeed balls installed in hardened steel cages, are the first option. These test better than anything else on the market. CNC-machined titanium pulleys with our Standard Bearings are the second. CNC-machined titanium pulleys with our standard CeramicSpeed balls installed in coated hardened steel cages is the third option. These are compatible with all Shimano 11-speed derailleurs. In the package: 2 x 11-tooth pulleys 4 x spacers UFO TECH BEARING OIL 15 ml dropper bottle for pulleys Decal