Cannondale C4 Alloy Seat post 27.2 X 320mm Black Cannondale C4 Alloy Seatpost 27.2X320MM Black . The Cannondale C4 seatpost is great for all your cycling adventures. Strong, lightweight and stiff, you'll have no problem riding over bumpy terrain. Material: Alloy . Color: Black Clamp type: 2-bolt -----Diameter: 27.2mm -----Length: 320mm -----Weight:12oz Taken off a Brand New bike. Unused ! Same day shipping order by 1 pm .