The Edison Collier fountain pen features a #6 steel nib engraved with the Edison logo. The Collier fountain pen is one of the most popular Edison pens in the production line, and is also the largest. The Collier is not designed to post the cap onto the barrel, but uncapped at 5 3/32" long, the cigar-shaped barrel fits comfortably in the hand. The Edison Collier fountain pen uses either the included standard international converter, or short standard international cartridges for your convenience. The nib options for the pen range from steel EF through Broad, plus 1.1mm and 1.5mm italic sizes, or upgrades to an 18kt nib are available.