Rock Shox Reverb Seatpost Service Kits. Features: Basic service kit includes collar bushing with sealing o-ring, internal/external damper sealhead and IFP glide bushings and o-rings Full service kit includes basic service kit plus bushing-collar dust wiper, bleed screw and threaded barb (post) attachment with o-rings, tubing strain relief collar, keyway bushings, and complete lower air valve assembly Specs: Description: A1 seatpost service kit, full