These cards are 4-1/4" x 5-1/2" in size when closed.  They feature a pocket and insert to hold a standard gift card (the pocket is approximately 3-1/4" x 4-1/4").  The pocket can also hold a small photo, money, long gum sticks, etc..  The file is compatible with both the 8x12 and 12x12 mats and come with all the paper elements shown.  

https://jamielanedesigns.blogspot.com/2018/01/z-fold-gift-card-holder-cards.html