For Santos-Dumont, R de Cartier, Santos de Cartier large model, Diabolo, Santos, Louis Cartier and Trinity ballpoint pens. Medium point.
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Cross Gel Rollerball Pen Refill - Black Fine (0.5MM) - Single Pack : Office Products
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Types of Pens: How to Pick a Pen with the Right Ink
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Ballpoint pen - Wikipedia
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Types of Pens: How to Pick a Pen with the Right Ink
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Ballpoint pen - Wikipedia
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Ballpoint pen Facts for Kids
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US8771410B2 - Ink for ballpoint pens and ballpoint pen using same - Google Patents
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What Is Ballpoint Pen Ink Made of?
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How Does a Ballpoint Pen Work? A Deep Dive into Mechanics - Dayspring Pens
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Art of Living on Cartier® Official Website