【MATERIAL】Seatpost made of aluminum alloy,strong and durable.
【SIZE】Length: 200mm,250mm; Diameter:25.4mm 
【USE&FIT】Seatpost used for for most old style bike,and the bike saddle with clamp.
【SAFE LINE MARK】Seatpost used for most mountain road bicycle, fixed gear bike, BMX bike etc. it is easy to instal.
【PAY ATTENTION】Please do measure the actual required diameter before purchasing. Saddle clamp is not included, please buy the saddle clamp separately if needed.