Hunter head design for easy saddle installation and full adjustability Unidirectional carbon manufactured using optimized carbon technology process Thumbscrew tightening system allows quick dialin 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)