S-Gel Retractable Gel Pens (Set of 4 ... These Amazon bestselling fine point pens are a favorite of Elena Armas, author of "The Spanish Love Deception." Often used by artists for drawing, they ...

[u407]’s 3D printed Signspinner was created as a clean/dirty indicator for a dishwasher, and at its heart is a mechanism that works a lot like that of a retractable ballpoint pen. Every click of ...