gsm is short for grams per square metre, and is often simply referred to as gm. It is a measure of the weight of a paper or card.
Everyday office paper has a weight of 80gm for every square metre. Most office and domestic printers can accept paper or thin card up to a weight of 160gm. A reasonable business card should be made from boards of a weight in excess of 300gm. Other properties of the card are also important. At busycards.com we use boards in the region 300-400gm.
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