Funn UpDown Dropper Replacement CartridgeThis high-quality cartridge is specifically engineered for use with your Funn UpDown dropper seatpost. It features a durable alloy construction which makes it immensely tough at handling all the abuse that comes with off-road riding. Perfect for replacing your old or worn-out existing cartridge, this version is an ideal choice of upgrade for breathing new life back into your dropper. Features: Material: Alloy Use: MTB Compatibility: Funn UpDown Dropper seatposts Buy Funn Components from Chain Reaction Cycles, the World's Largest Online Bike Store.