ULTIMATE USE Alien Aluminium Seat PostThe Alien Aluminium Seat Post has been specifically designed by ULTIMATE USE to provide outstanding performance for road riding. Using computer aided design and a tapered construction, it offers the perfect balance of strength, rigidity and flexibility. This construction ensures you'll enjoy efficient power transfer and avoid the worst of the roads vibrations.Features: Material: Butted Aluminium Layback: 10mm Clamp designed for standard 7x7mm saddle railsBuy ULTIMATE USE Components from Chain Reaction Cycles, the World's Largest Online Bike Store.