Your Montblanc multi-pen holds mini ballpoint refills. They measure approximately 2-1/2" long. We offer a Monteverde mini ballpoint refill that contains liquid ink. Select from up to eleven different colors.
If your Montblanc multi-pen or mechanical pencil needs refill lead, you will first need to determine the diameter used. You will see the .5mm, .7mm, and .9mm options shown below.