Thomson Elite Seatpost. Features: Claimed 40% stronger on ultimate strength test than the strongest production seatposts on the market Post and cradle machined from 1-piece 7000 aluminum 41mm rail clamping area, micro adjust and dual pivoting bolt head Zero clamp offset, 235g (27.2x330mm) Specs: Diameter:30.0mm Length:410mm Setback:zero Color:black