High Quality Content by WIKIPEDIA articles! A paper knife or letter opener is a knife-like object used to open envelopes or to slit uncut pages of books. Electric versions are also available, which work by using motors to slide the envelopes across a blade. These have the advantage of being able to handle a greater volume of envelopes, but the blade can slice into the contents of the envelope and damage them.Letter openers may be composed of wood, metal, plastic, sometimes even ivory, or a combination of materials.

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