Strathmore Artist Trading Card Frame Card. It is a white tri-fold card featuring a cutout window which accommodates an Artist Trading Card (2.25 in. x 3.25 in. opening). Card slide easily into the pocket and provide a great way to display or send your trading card. 1 Envelope included. Frame card size: 3.5 in. x 4.875 in., Envelope size: 3.625 in. x 5.125 in. 1 frame card, 1 envelope and 1 ATC sleeve included.