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A4, A5, A6, DL sizes; flat or folded; single or double sided; uncoated, satin or gloss paper; offset, digital Indigo or digital toner...
Leaflets are popular for sharing detailed information in a highly presentable way. They are usually colourful, and are an efficient format for providing information.
Uses for leaflets include: the conveyance of company information, products and services; point-of-sale cards; restaurant menus, invitations; event notices... etc.
Consider the intended use for your leaflets when choosing the type and weight of paper to print on. If the intention is for the product to be handled and re-used, consider the heavier weight stocks, and a satin finish. Otherwise, a lighter weight is often sufficient.