Both of these pens are very heavy with a comfortably wide girth. However, because they are so heavy they tend to fatigue my hand after extensive use - especially the fountain pen, due to the length. The cap posts securely on the black end but it is too heavy for my taste, so I write with it un-posted. The fountain pen is wide and long enough to write comfortably un-posted. The nib is large and writes wonderfully smooth. The ink supply can be provided by either a standard cartridge or converter.
Several years ago, before the fountain pen bug bit me, I purchased the rollerball version of this pen, which is one of my favorite pens to use if I am not using a fountain pen. The top chrome portion of the pen twists to push the cartridge up and down. It takes the Schmidt rollerball cartridges that are consistently smooth cartridges that never skip.
I don't mind the heavy weight of these pens because they are of such fine quality and workmanship and because they write so well. They are two of my favorites.