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Rollerball pens: Tips for Selecting and Using Tombow Rollerball Pens
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111.1mm (4.375") - The Pen Refill Guide
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Office Depot
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111.1mm (4.375") - The Pen Refill Guide
The Lamy 2000 Rollerball and all the refills it can take (without major hacks) : r/pens
