The EC90 post offers the same groundbreaking weight and performance of Easton's flagship EC90 Zero. The difference is that this seatpost features 20-millimeters of setback to help riders fine-tune their bike fit. The EC90 utilizes full carbon fiber construction including the upper and lower clamping plates . And, of course, this thing is plenty strong too. By incorporating RAD Relief-Area Design and TaperWall technology, the EC90 has been intelligently designed to distribute stress along the length of the post. We also remove material in critical clamp zones to prevent pinching the carbon which can sacrifice durability . Finish UD MATTE CARBON Weight 200gr 31.6 Quill Sizes 27.2, 30.9, 31.6 Material EASTON EC 90 CARBON Head Type 20mm OFFSET