The Kaweco Standard Pearl Black Converter is designed for larger-bodied fountain pens. This standard converter, in Pearl Black finish, is designed for the larger body of models such as the Perkeo and AL Sport, replacing the disposable ink cartridge. It allows you to refill the pen directly from an inkwell and choose from a much wider range of ink colors. It is a preferred option for those who own a Kaweco Perkeo or AL Sport and prefer to refill with bottled ink instead of using disposable cartridges.