The Supra Brass fountain pen has a connecting piece included that extends the fountain pen by 3 cm. This way you have the option to use it as a pocket-size pen or extend it for a longer version. The long version can also hold 2 standard size ink cartridges, or you can use the long converter as well. The fountain pens are enhanced with a steel nib, available in M, F, and XF and B widths. Cartridge fill.