31.6 mm Mountain Bike Seatpost Road Bicycle Dropper Hydraulic Lifting Remote Control Adjustable Seatpost Tube The comfortable oil pressure suspension has a pain-relieving effect on the back area as it provides optimal shock absorption and makes soft reaction during Cycle.  Features: The height can be adjusted freely between 0~100mm. The hydraulic system can provide sufficient pressure , achieve better riding experience. Suspension seat post with coil spring improves both the riding comfort and the buffer ability.  Extreme torsion (10.9 N ) being applied to the screws, offers superior stability. Clamp head angle is adjustable, you can find a comfort saddle angle for your personal love. Seal ring isolates it from dust, water and prevents  oil leakage efficiently. Quality Aluminum alloy construction,strong, durable and corrosion-resistant. Specifications: Material: Aluminum alloy. Color: Black. Angle: -5° + 18° Ttravel: 100 mm / 3.9 in Type: External Cable Routing / Internel Cable Routing ( optional ). Internal Cable Routing: Diameter: 30.9 mm / 31.6 mm (optional). Seat Tube Length: 400 mm / 15.7 in Inner Cable Length: 170 mm / 6.7 in Weight: 653 - 679 g / 23.0 - 24.0 oz External Cable Routing: Diameter: 30.9 mm / 31.6 mm (optional). Seat Tube Length: 375 mm / 14.8 in Weight: 628 - 650 g / 22.2 - 22.9 oz Product Weight: 1746 g / 3.8 lb Packing Size: 45 * 5 * 5 cm / 15.7 * 2.0 * 2.0 in Packing Weight: 700 g / 24.7 oz Package List:  1 * Bike Seatpost