Oval Concepts 900 Seatpost Road MTB 31.6 x 400mm Carbon Aluminum Black 267g Material: Structural UD carbon wrap, 2014 T6 aerospace aluminum alloy Technology: Internal ovalization reduces weight while increasing strength Clamp: Two bolt design, 25mm offset, finite adjustment, marine stainless bolts Diameter: 31.6mm, Length: 400mm, Road or MTB use Weight: 267g on average