RockShox 600 Hour/2 Year Service Dropper Seatpost Service Kit Description: RockShox Reverb Seatpost Service Kits work to restore dropper seatposts at regular service intervals. Note: Requires Oil Height and IFP Depth Tools Features: Original replacement parts for RockShox Reverb AXS dropper posts Basic service kit includes collar bushing with sealing O-ring, internal/external damper sealhead and IFP glide bushings and O-rings