Ultimate use alien carbon seatpostthe alien carbon seatpost has been specifically designed by ultimate use to provide outstanding performance for your road rides. Constructed from high quality carbon fibre and benefiting from computer aided design, it offers you the perfect balance of strength, rigidity and flexibility. This construction ensures you'll enjoy efficient power transfer and avoid the worst vibrations when riding over poor road surfaces.features material carbon fibre shaft, aluminium clamp head finish 3k matt setback 10mm saddle rail compatibility clamp designed for standard 7x7mm saddle rails recommended seatpost clamping force 3.5nm single bolt saddle rail clamp design for faster and easier adjustments alternative saddle rail clamps available to purchase separately weight 140g 27.2mm diameter, 300mm lengthbuy ultimate use components from chain reaction cycles, the world's largest online bike store.