75 - 100gsm: Standard office paper, used in your desktop laser printer or photocopier
110 - 120gsm: Commonly used for stationery paper for things such as letterheads
130 - 170gsm: More durable paper usually used for posters, leaflets, flyers and pages inside a book.
170 - 200gsm: Midway point between paper and card. Used for brochure covers and is great when used for more luxurious posters or quality double sided flyers
200 - 250gsm:Regarded as card, ideal for document covers. 250 gsm paper is commonly used for greetings cards, invitations and booklet/brochure covers
250 - 300gsm: Regarded as card, can add a quality finish to a book if used as a cover. Also used for business cards