The Kaweco Perkeo fountain pen, in petrol blue, with a Medium (M) nib, offers a fuller, more expressive line, making it a good option for signatures and looser writing. This set includes 3 ink refills, ready to use after purchase. 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 looking for a larger fountain pen ready to write with, without needing to buy refills separately.