-Carbonex composite seatpost. -Machined 6061-T6 alumium alloy one bolt head. -Available in 22.2, 26.8, 27.0, 27.2 or 31.6 mm diameter. -300 or 350 mm length (22.2 mm in 250 and 300 mm only).         -Inexpensive seatpost for when a really light-weight post isn't necessary or in the budget. -100% alloy. -One bolt head. -Available in 26.8, 27.0, 27.2, 31.6 and 31.8 mm diameter. -350 mm length. -Black or silver.