Black ink Medium line width Waterproof according to ink standard ISO 12757 Wear-resistant stainless steel tip guarantees that the large ink supply can be fully used and does not smear Compatible with: Express 75, Office 575, Paper Mate PHD Ultra and Aspire, PHD, PHD Ultra, RT50, Aspire, Deluxe Powerpoint and many more Listing is for 3 refill's .
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