See the world’s smallest greeting card: Smaller than a postal stamp

British scientists claimed that they have created the world’s smallest Christmas card, a seasonal greeting so tiny that over 200 million of them could fit into a standard postage stamp.

The card, created by the National Physical Laboratory (NPL), the U.K.’s national measurement standards laboratory, measures 15 x 20 micrometers. A micrometer is one-millionth of a meter.

It is made from platinum-coated silicon nitride and was illustrated using a focused ion beam. The card’s cover features an etching of a snowman, above the words “seasons greetings,” as well as a seasonal message inside.

According to reports, the previous smallest Christmas card measured 200 x 209 micrometers and the new card is 100 times smaller.

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