If you need a refill for your Montblanc pen, and want to maintain the way it writes, an original Montblanc refill is clearly the best choice. Fortunately, they make a top quality range of refills for their pens, including fineliner refills for many, usually for pens that would otherwise be rollerballs. Montblanc are also renowned for their high quality fountain pen inks, including many special editions.