No ink pen

The solid metal 'nib' consists of a metal alloy, that leaves a mark on most types of paper. If you use the sort of paper typically used in printers and photocopiers, the pen leaves a mark that looks as if it was made by a pencil. However the line will not smudge, and cannot be rubbed out. Since there is no ink, there is nothing to dry out, so the pen will work just as well in 25 years time as it does today. And of course it never needs sharpening! I would guess that in time the nib would begin to wear down, as you are leaving a small amount of metal on the page. However this has got to be a much slower process than with a pencil, which wears down pretty quickly.

Source: grand-illusions.comAdded: 9 January 2007