For Drop-A-Gogo II, Drop-A-Gogo, and BIG Drop-A-Gogo dropper posts, air cartridge incl. adjustment unit, for maintenance and replacement use CONTEC service kit "Drop-A-Gogo A"With the CONTEC service kit "Drop-A-Gogo A", you can perform maintenance on your "Drop-A-Gogo" or "Big Drop-A-Gogo" dropper post yourself. The air cartridge comes with an adjustment unit and is suitable for various travel ranges and diameters. By simply replacing the old cartridge with a new one, you can restore the functionality of your "Drop-A-Gogo" or "Big Drop-A-Gogo" dropper post. The respective length and diameter indicate which dropper post the service kit is suitable for. Main color silver Type/kind Accessories Version dropper post