SRAM's 1x Eagle component system features a twelve-speed cassette. We have built pulleys that handle the load better than standard ones. These CeramicSpeed Pulleys operate with less friction, increasing power transferred to the rear wheel, ensuring greater durability and longer replacement intervals. These pulleys are also fully compatible with the SRAM Eagle AXS derailleur. Both the upper and lower pulleys feature a narrow-wide tooth design. Both pulleys have 14 teeth. When you choose them, you must select one of two options. Pulleys milled from aluminum with our CeramicSpeed Balls in stainless steel races. These win efficiency tests everywhere, outperforming manufacturers' pulleys. The second option has aluminum pulleys with our CeramicSpeed Balls in coated, hardened steel races. Note: Not compatible with the new SRAM Eagle Transmission In the package: 2 x 14-tooth pulleys UFO TECH BEARING OIL for Pulleys, 15ml dropper bottle UFO TECH BEARING GREASE All Round Decal