The Cannondale DownLow Dropper Post is an easily adjustable, easily serviceable, air/hydraulic unit that includes a handy cable remote. It goes up. It goes down. You need one. Adjusting your seat whilst on the move could not be simpler.  Cannondale DownLow Dropper Post Features 100mm drop w/ 440mm length from seat rail to bottom of post Cable actuator extends 27mm below the bottom of the post 340mm maximum height at minimum insertion point Kit includes: Dropper seatpost, Cable and housing, 1x dropper lever