Fsa sl k mtc sb0 seatpostthe sl k sb0 seatpost is lighter and stiffer than ever just 222 grams for the 272 x 350mm length using a ud carbon shaft with a bonded alloy head and a sophisticated mtc clamp design we can achieve what we believe is the finest seatpost yet available with a polymer di2 battery holder features material ud carbon shaft with bonded alloy head cr mo steel hardware finish ud carbon setback zero weight 222g 272 x 350mm not di2 compatiblebuyfsa componentsfrom