Compatible with any of our Eagle ecosystem cassettes and crank arms, the upgrade kit allows you to experience AXS without needing to buy an entire groupset provided you already are using Eagle products. No matter if you are looking to upgrade your ride, or looking for great value replacement parts, look no further than the GX AXS upgrade kit.Includes: Rear derailleur with protector, Battery, POD Controller w/Infinite Clamp, Powerlock, Charger/Cord, Chain Gap Tool, SRAM Multitool