This is a G-pen nib. It came out during a house clearance. It's old, but it looks usable, so I'm putting it up for sale. I don't know the details, so please check the condition in the photos. There were other things besides the nibs, so I'm including them as a bonus. If you don't need them, please let me know in the comments. The nibs are Zebra and Nikko. Thank you.