This is a self-made adapter for Montblanc ballpoint pen refills. It's an adapter that allows you to use current refills in old MONTBLANC ballpoint pens (Noblesse and hammer trigger type). It was handmade with resin. I've confirmed that it fits without any problems. The third photo shows an example of how it's installed; the refill is not included. *The images are reused. Currently, it's difficult to obtain genuine adapters. Are you looking for one? The product is carefully made one by one, but please understand that it is a handmade item. *There may be tiny air bubbles.