Here is the best pen model through "just about anything": banknotes and other miscellaneous papers, coins, even your cheek!
The strong point is this: there is only one pen (okay, it already existed), but this one can be examined at the beginning and end of the routine and really write, at any time.
Nothing to remove, nothing to add, it's sort of the ultimate version of the category.
John Cornelius makes it himself by hand, which makes it a real gem.
Item available exclusively on order.