Mats are sold a la carte in small, medium and large united inch sizes. To get the united inch add the long side to the short side. Small (0-36 united inches) Medium (37-60 united inches) Large (61-72 united inches) When choosing a mat for your art, add the amount of mat margin to your image size. Ex: if your artwork is 30x24 and you want a 3 inch margin (industry standard). Your new finished frame size will then become 36x30 . Total united inches is 66 . *** 66 is a LARGE *** Mats are made with a standard 3" mat opening Double Mats have a 1/4" reveal. Please note in comments if you want something custom Thanks for visiting Picture This, Inc. See Description Free shipping to the United States MD add 6% tax
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