This is an artist trading card crystal clear box/case that fits a normal deck of 52 cards (1/2 inch thick). To get an idea of its size, it holds a standard deck of cards. The dimensions are exterior: 2 3/4 in. x 3 3/4 in. x 1/2 in. The interior dimensions are 2 1/2 in. x 3 1/2 in. x 3/8 in. Great for holding ATCs from a swap. Send this with your swap cards to the hostess. She will love it!! Also great for holding your blank ATC background papers or use them to store small embellishments like postage stamps, brads, eyelets, buttons, paperclips etc.