A5 Photo Paper is precisely half the size of an A4 sheet and slightly bigger than the popular 13cm x 18cm (or 7x5"). A5 is used extensively for photo prints and as a greetings card paper for a whole host of events. Instead of buying a ready made card, buying the raw material will allow you to get the design you want using any Inkjet printer and normal inks. These papers are all instant dry and will yield sharp results. Simply print on the paper and insert into an envelope!