The RockShox 3.2 RC2 damper upgrade kit offers intuitive HSC/LSC controls and features ButterCups technology to make setup fast, understandable, and easy to communicate.Compatible with RockShox ZEB fork models: FS-ZEB-SEL-B1, FS-ZEB-UFA-B1, FS-ZEB-ULT-B1New Rebound/Compression tunes that match Linear XL air spring, achieves virtually silent performance, keeping riders focused on the trailButterCups technology blocks 20% of high-frequency trail chatter to reduce hand and arm fatigueDelivers speed-sensitive control with fully independent High Speed and Low Speed Compression dampingIncludes complete right side internals RockShox Charger 3.2 RC2 Damper Upgrade Kit Damper, Compression UPC: 710845927553