Thank you for viewing. I purchased these as a set of 5, but I have many other pens and haven't had much opportunity to use them. I'd be happy to pass them on to someone who wants them. They were stored with the unused red ball still on the pen tip (see photo 4), but I wanted to check if the ink flowed properly, so I removed the ball and tested it. It seems to be working fine, so I'm listing them for sale.