If you want the best, go straight to the source. These are Fox's Low Friction seal kits — the same seals used on their premium line of "Factory Series" forks. FEATURES: Great hop-up for your older Fox fork, essential for your newer Fox Fork Inspect and clean and/or change every 125 hours of riding use or annually for maximum performance and fork longevity. Select the kit that matches the stanchion tube size of your Fox fork Note: S eals do not work on older forks with "flanged" style lowers and proper seal driver tool is necessary for proper installation.