Mini Pen Insert for the Sketch Pencil

This 5.6mm insert converts any 5.6mm lead pencil to a pen! The insert holds a standard mini pen refill so the insert can be refilled indefinitely and with optional mini refill colors. Use the insert by simply popping out the lead of your 5.6mm sketch pencil and popping in this insert. Each insert includes a black ink mini pen refill. The refill easily unscrews from the insert for replacement. The converter uses a Schmidt 635 refill or Schneider Express 56 refill.