30.9mm/31.6mm Mountain Bike Seatpost with Adjustable Height MTB Cable Controlled Hydraulic Seatpost Remote Internal Inner Cable Routing Bicycle Seat Post Features: Aluminum alloy material,lightweight and durable. Hydraulic and air pressure cartidge ensure fast and smooth raise.But you need to press down the seat to get the lowest point by labor. Wire controlled height adjustment meets your different needs. Compatible with internal routing remote control only. (control switch at the bottom). Come with a set of wire control components. Easy to tailor the cable length as you need. Cable length: 1600mm/5.2ft. Only suitable for most mountain bikes with the handle diameter: 22.2mm. Specification: Outside Diameter: 30.9mm / 31.6mm (optional) Max. length: 345mm / 395mm / 445mm (optional) Model: KS EXA 900i Type: Wire Controlled Hydraulic Seatpost with Internal Routing Material: Aluminum alloy Fits handle: 22.2 mm Seatpost weight: approx. 474 - 615 g / 16.7 - 21.7 oz Cable length: 1600mm / 5.2ft Package weight: approx. 527 - 668.4 g / 18.6 - 23.6 oz Package List: 1* Wire Controlled Hydraulic Seatpost 1* Set Of Wire Control Component NOTE: Check the size of your seatpost,choose the same size as the diameter before ordering.