Fox Factory Ifp-R Monotube Shocks For Harley FXR FOX's Ifp-R rebound adjustable design, combined with vehicle specific damping and linear spring rates, gives you a confident connection to the road while soaking up the bumps, mile after mile. Features wide range internal rebound control also has 12 distinct clicks, allowing you to tune the exact rebound rate to balance out your spring preload and keep your rear wheel firmly planted on the road. With an internal floating piston to separate the nitrogen gas from the shock oil, the Ifp-R shocks will maintain damping control no matter how long you ride. Features: Gas-charged mono-tube, with Internal Floating Piston (Ifp) 1-1/2 6061-T6 aluminum type III hard anodized body Spring preload setting guide marks Fully rebuildable and revalveable Advanced high-flow, deflective disc velocity-sensitive damping 5/8-inch low friction, super-finished hard chrome shaft