The Inkless Metal Pen features a special metal alloy tip. As you write, tiny amounts of this metal are deposited onto the page. The silvery markings may resemble pencil, but they are permanent and completely smudge-proof.
The Inkless Metal Pen
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In "Gross Pointe Blank," John Cusack stabs his would-be assassin with a cheap plastic pen. Think of how much faster that fight would have been over with THIS sucker.