Carbon seatpost with a tested low-profile clamp with 2 bolts that do not fall out on the bottom. Features: low profile clamp reduces tension on lightweight rails and does not turn the bottom part out. 2-bolt design that securely holds the chair in place and is easy to adjust Specifications: Defined color: Black Material: Carbon Length: 350 Diameter: 1,071 in compensation: 25 Type of clamp.