Suitable for most road bike, fixed gear bicycle, mountain bikes.SpecificationsMaterial: carbon fiberColor:blackWeight:about 220gLength: 350mm/400mmTube Outter diameter:27.2mm,30.8mm,31.6mm.Extra Length:Help to raise height of saddle,so that tall rider do not have to bent much forward.Features:Clamp is adjustable for the saddle tilt anglePackage includes:1 X Bike SeatpostBefore ordering, please do make sure to measure and confirm the diameter that you actually need, Thank you.Note:1. Color might be slightly different due to the color calibration of each individual monitor.2. Please allow measuring deviation due to manual measurement.3. Thanks for your understanding and enjoy your shopping moment!If you have any questions, please contact us in time, we will solve the problem in the first time.