How to Change Ink Cartridge

Pen - Wikipedia
A ballpoint pen dispenses an oil-based ink by rolling a small hard sphere, usually 0.5–1.2 mm and made of brass, steel, or tungsten carbide. The ink dries almost ...

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Sheaffer 'K' Ballpoint refill, available in both medium and fine points, available with black or blue ink. Suitable for Ferrari ballpoint pens.