The OneUp Dropper V3 is a high performance dropper post, and you&';ll need to keep on top of servicing it to retain that performance! This kit includes all of the bushings and seals you&';ll need to perform a complete service on your OneUp Dropper V3. You will need a high quality light suspension grease such as Slickoleum and some tools to complete the service. Check out OneUp&';s service guide for a fantastic service tutorial! Compatible with OneUp Dropper V3 in 30.9, 31.6, and 34.9mm diameters. Not compatible with OneUp Dropper V3 in 27.2mm diameter.