Roller Ball Pin With Fountain Pen Ink Colours

A lot of companies use a schmit part that you can just buy to build around. So now i have like a roller ball pin with the fountain pen ink colours. It really works well, and i would be interested to see if it continues to work well with other inks. There's definitely going to be some question whether did i accidentally make the perfect ink selection? With the the ink formulation to roll smoothly from the ball tip. I'm thrilled with how this is.