Outside diameter: 27.2mm. Length: 440mm. Travel: 125mm. Cable length: 1.5m. Cable diameter : 4.5mm. External cable dropper seatpost..This dropper seatpost is made of alloy 7075 which is very strong and light (828g in weight). The maximum weight capacity can reach 200kg..Note1: If your seatpost diameter is less than 27.2mm, please do not choose this dropper post. If it is more than 27.2mm, you can purchase additional seatpost adapter(seatpost shim) such as 27.2 to 28.6/30.4/30.9/31.6/33.9mm to fit your bike..Note2: There is a hexagonal nut near the dropper lever, and the lifting speed of this dropper post can be adjusted by adjusting the tightness of the nut..Note3: Please do not cut the cable before the adjustment is completed, please leave a certain length of cable for future adjustment.