The Kaweco Perkeo fountain pen, in green, has a fine (F) nib, a balance between fluidity and precision suitable for everyday writing. The Perkeo is Kaweco's modern reinterpretation of the pocket pen concept, with a larger body than the Sport (13.9cm closed and 15.7cm with the cap attached) and a snap-cap closure, eliminating the need for threading. The injected resin body maintains the characteristic octagonal cap design, along with a 16-sided groove on the bottom for easier grip. It uses a #5 stainless steel nib and the same international short cartridge or converter system as other Kaweco pens. It's a prime option for those seeking a larger fountain pen in this color.