Spring Coil Suspension: Build-in Spring Coil And Damper Rubber Absorb The Vibration While Riding, The Seat Post Comfort Your Riding Experience, Improve The Shocks. Rebound Force Adjustable By Tighten Or Loose The Bottom Screw. Suspension Travel 42mm/ 1.65inch.pay Attention To Choose Correct Diameter Size . Wrong Size Will Not Work And Will Cause Return. Take Out Your Current Seatpost, The Diameter Marked On Its Lower Area. Then Buy Same Size From The Option.clamp Angle Adjustable: Saddle Clamp Angle Can Adjust In -5 Degree To +18 Degree. Clamp Offset 14mm.excellent Quality: Produced By World Largest Bike Components Supplier Hl Corp And Comply To International Bicycle Safety Standard Iso 4210. Full Aluminum 6061 Body Ensure The Lightweight, 27.2mm Weight 498g/ 1.1lbs, 31.6mm Weight 508g/ 1.2lbs. It Fit For Riders Weight 50kg/ 110lbs To 100kg/ 220lbs(clockwise The Bottom Screw If You Are Heavy, Anticlockwise It If You Are Lightweight).