Use all kinds of paper, you are no longer restricted to using the paper sizes that your printer offers. easy card has built into it Red River Paper Sizes so that you can use Red River Paper with easy card, and easy card has the provision for custom sized paper. Enabling you to print greetings cards at any size you wish. easy card features a patented envelope system that can use the same sized paper for creating a envelope for your card that requires no sticking (double fold cards only). If you are unsure which paper size and type to use with easy card we recommend that you purchase the "Card Shop Sample" pack from Red River Paper. This pack contains a selection of different sized card, along with different types of card, and of course they all work beautifully within easy card.