Feature:1. Strong and Durable: Using high strength aluminum alloy material, high hardness, fine workmanship.2. Adjustable Softness and Hardness: Use 6mm hex key to adjust softness and hardness, comfortable riding.3. Double Nail After Drift Design: Seatpost adopts double nail after drift design, two screws locked not easy to break.4. Applicable Model: Mountain bikes, on behalf of driving, road bikes (must make sure that the caliber is the same)5. Easy to Install and Remove: Without any professional requirements even though you are an amateur.Specification:Item Type: Bike Suspension Seatpost Material: Aluminum AlloyWeight: Approx.580g/20.5ozProduct Caliber: Approx. 31.6mm/1.2inLength:Approx.350mm/13.8inApplication: Mountain Bikes, on Behalf of Driving, Road Bikes (must Make Sure That the Caliber is the Same).Package List:1 x Bike Suspension Seatpost 1 x English ManualNote:Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.