MontBlanc Pen Refill. SKU: 128231. Barcode: 4062037052533. Color: Mystery Black. Montblanc 2 Rollerball Refills Medium Mystery Black. Montblanc Rollerball refills, Mystery Black. Suitable for all Montblanc Rollerball/Fineliner Pens except Meisterstuck LeGrand, Montblanc M and Heritage collection capless Rollerballs. Refill type = Medium.