RockShox Reverb Full Service Kit - 11.6818.003.010RockShox Reverb Full Service Kit 11. 6818. 003. 010 The RockShox Stealth Reverb Seatpost Service Kit contains all the parts needed for periodic maintenance and or rebuilding of Stealth Reverb seatposts. It contains all the guide rings, seals and connectors to refurbish your Stealth Reverb with internal passage. Includes a one piece blue U jointed internal floating piston (IFP) Rebuilds IFP, valve, seal head, dust seal, piston, brass keys and bushing