Product details:

SL-K seatpost SB20 The new SL-K SBS SB20 seatpost is lighter and stiffer than ever just 221 grams for the 27.2 x 350mm length. Using a UD carbon shaft with a bonded alloy head and a sophisticated SBS clamp design, we can achieve what we believe is the finest SL-K seat post yet. Available with a polymer Di2 battery holder. Features UD Carbon shaft with bonded alloy head Forged alloy Top Clamp Fit 7mm standard rails and 7X9mm oval rails Chromoly Hardware UD carbon finish Black graphics Specifications Discipline ROAD, MTB Material Carbon Weight 221g Compatibility WE Di2 Length 350mm, 400mm Offset 20mm