DJC MTB Dropper Seatpost Adjustable Height 125mm 150mm travel

There are 3 different models in this link:
1. Inner routing with vertical switch, 30.9mm or 31.6mm. It for 1x speed and 2x speed bike.
2. Inner routing with southpaw switch, 30.9mm or 31.6mm. It for 1x speed only, not support 2x speed bike.
(need to ensure the frame tube bottom have a hole to pass the cable before buy inner routing models)

3. External routing with vertical switch, 30.9mm or 31.6mm.

Features
Diameter 30.9mm and 31.6mm is not exchangeable. Do check your bike seatpost diameter before buy.
150mm Travel for internal Cabling, 125mm Travel for external Cabling,it can stop at any position. Rebound automatically.
Excellent Reliability: Body 3D forged by Aluminum 6061, sealed cartridge and cable from top level suppliers. Trouble free while use it.
Clamp Angle Adjustable& Cable Tight Adjustable: Saddle cradle angle adjust from -5 degree~+18 degree. Cable sensitivity also adjustable by the screw adjuster with your thumb. No side-play with its patent technology.
Easy Install: Bottom connector make it super easy to install the cable system. 3 steps can finish install.
1 year warranty.
Package content with switch and cables.

About
The manufacturer has been a leading supplier to the bicycle industry for almost 40 years, with a focus on providing innovative handlebars, stems and seat posts to bicycle assemblers and consumers globally. As could be expected from one of the world's largest component manufacturers, we are equipped with world-class research, design and production facilities to offer you best products.