Rollin' in it: Two of My Favorite Rollerball Refills That Aren't the Schmidt P8126/P8127 — The Gentleman Stationer
StarWalker Blue Planet Precious Resin Fineliner - Luxury Fineliners – Montblanc® BE
Montblanc Fineliner Refills (B) Mystery Black 105170 – Refill Cartridge with a Broad Tip for Montblanc Fineliner and Rollerball Pens – 2 x Black Refills : Amazon.co.uk: Stationery & Office Supplies
2 Fineliner Refills Medium, Mystery Black - Fineliner pen refill – Montblanc® SE
Montblanc Fineliner Refill - Pen City
Montblanc black Rollerball & Fineliner refills compared. : r/pens