Upgrade your suspension fork with ultra-low friction SKF wiper seals providing an unmatched suspension feel, all while keeping the dirt where it belongs- because no one wants dirt in there. Details: Rockshox / SKF Collaboration Model: FS-UPK-WL-A1 Compatibility: 32mm: RockShox Bluto, RS1, SIDB1(2017+), 32mm Boost forks 35mm: RockShox 35, Boxxer, Domain, Lyrik B1, Pike, Revelation, Yari 38mm: RockShox Zeb ( A+/2021+), Domain B1+ (2022+)