Giant refill ISO 12757-2 G1, for clean and waterproof writing up to 6000m. Wear-resistant stainless-steel tip guarantees clean and complete use of ink. Medium point writes approx 0.4mm line. The refill is 106mm long, 30mm from tip to the shoulder. This refill is generally compatible with the Paper Mate Lubriglide refill for modern Paper Mate pens and also should be compatible with the Paper Mate PowerPoint refill. It often fits vintage Paper Mate pens that used the Lubriglide refill, but compatibility problems are more common with older pens. Unfortunately, the only way to know for sure is to try it. Large Ballpoint Pen Refill EXPRESS 225 M Blue, ISO 12757-2 G1, Indelible Refill for Express ballpoint pen 225 M bl Express refill with stainless steel tip