Fsa sl k sb20 carbon seatpostthe fsa sl k sb20 seatpost is lighter and stiffer than ever just 222g for the 272 x 350mm length using a ud carbon shaft with a bonded alloy head and a sophisticated mtc clamp design fsa can achieve what they believe is the finest seatpost yet features materialud carbon shaft with bonded alloy head forged alloy sbs 2 bolt head crmo steel hardware finishud carbon setback20mm weight221g 272 x 350mmbuy fsa components from chain reaction cycles the