A ballpoint pen (Philippine English: ballpen, British English: biro) is a writing instrument, with an internal ink reservoir and a sphere for a point. The internal chamber is filled with a viscous ink that is dispensed at its tip during use by the rolling action of a small sphere. The sphere, usually from 0.5 mm to 1.2 mm in diameter, may be made of brass, steel, tungsten carbide, or any durable, hard (nondeformable) material.
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Famous quotes containing the word pen:
“Prove that ever I lose more blood with love than I will get again with drinking, pick out mine eyes with a ballad-maker’s pen and hang me up at the door of a brothel-house for the sign of blind Cupid.”
—William Shakespeare (1564–1616)
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