Feature:1. Seatpost adopts double nail rear float designed, both screws 10.9 class torsion screw, locking is more stable.2. Sealing ring designed, rain-proof and dustproof, protect seatpost, also won't leakage oil.3. Bottom display fine tuning screw, factory have good adjustment, no need to adjust.4. Lifting seatpost adopts oil pressure system, not pure air pressure, but also has air interior oil pressure, the degree of lubrication much higher than the pressure, lifting seatpost mounted on suspension rod, completely unaffected by the side, coil spring provides the proper compression and rebound damping for easier riding.5. Two sizes for you to choose, to meet different needs and requirements.Specification:Condition: 100% Brand NewItem Type: Wire Control Lifting SeatpostMaterial: 7075 Aluminium AlloyColor: BlackApplication: Road Bicycle, Mountain BikeSize: Approx. 43x42mm/1.69x1.65inchWall Thickness: Approx. 3mm/0.12inchExternal Wiring Length: Approx. 375mm/14.76inchOptional Diameter: Approx. 30.9mm/1.22inch, 31.6mm/1.24inchOptions: External Wiring 31.6MM*375MM, External Wiring 30.9MM*375MMInternal Cable Length: Approx. 170mm/6.69inch.Package List:1 x Seatpost1 x Wire Control1 x Manual6 x Accessory