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A common ballpoint pen knife with a concealed blade (top), and an unsheathed blade (bottom).
A ballpoint pen knife is a multi-tool pocketknife consisting of a blade concealed inside an ordinary-looking ballpoint pen. The blade, typically 50 to 125 millimetres (2 to 5 in) long, is hidden when not in use. They first appeared as custom-made pens from various custom knife makers, and were later mass-produced by other companies.
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