Different paper textures and weights for distinctive looks Understanding Paper Weight — GSM A quick word on paper weight. In the UK and Europe, paper weight is measured in GSM  - grams per square metre. The higher the number, the heavier, thicker, and more substantial the paper feels. As a rough guide for wedding stationery: 150–170gsm  — lightweight paper. Good for inner pages of programmes or booklets, not for standalone pieces. 250–300gsm  — the standard range for most wed

A Guide to Paper Sizes for Wedding Stationery (And What to Actually Order)