The flush cartridge of VEB Füllhalterwerk Wernigerode was a cleaning device for cartridge pens. It consists of a small bellows connected to a roughly 25 mm short plastic cartridge. The associated packaging measures around 7 cm in height with a base of about 3 by 3 cm and bears on three sides a pictorial instruction. Although the plastic cartridge has no tip like a conventional ink cartridge, cleaning works reliably on usual cartridge pens.