Race Face Next-SL Carbon Seatpost. Features: Hunter head design for easy saddle installation and full adjustability Unidirectional carbon manufactured using optimized carbon technology process Thumbscrew tightening system allows quick dial-in of the saddle angle by hand Angled clamp bolts allow easy tool access for hassle free adjustment Rubber grommet seals the post to prevent water from entering seat tube Accepts 7/8mm CrMo/alloy and 7/9mm carbon rails. 250g (30.9mm) Specs: Diameter:30.9mm Length:400mm Setback:zero Color:UD carbon