SD419S 2016 new Tmars mechanical adjustable seat post by remote wire Travel: 0 / 55mm / 110mm (3 Positions) Color: Black Outer Diameter: 27.2 mm Lenth: 445 mm Weight: 575g Meterial: Alloy 6066 main tube with Alloy 6066 inner axle tube. Finish: balck anodised Including a rubber boot dust seal Remote alloy action lever mounts on the handlebar . instructions are included. We have all part that you may need. Made in Taiwan