Perkeo is Kaweco's entry-level full size fountain pen! The octagonal cap and faceted body is formed from plastic in unexpectedly fun color combinations and is highlighted with a comfortable triangular grip section. The pen uses standard cartridges or a full size Kaweco converter (sold separately) for use with bottled inks. Each pen is outfitted with your choice of either a fine or medium point steel nib and includes blue ink cartridge.