A beautifully made, superlight twin bolt, race seatpost. 7075 CNC butted alloy shaft with layback off-set forged alloy 2 bolt micro-adjust cradle system.MBR 8/10"Overall this is half the price of a Thomson and weighs less...".27.2mm x 300mm. Weight 215g.27.2mm x 400mm. Weight 253g.30.9mm x 300mm. Weight 220g.