The Large Iris card is the size of a typical greeting card 5" x 7". It functions as a mechanical iris similar to those used in photography aperture mechanisms. A tab on the card can be manually rotated to progressively open the hole in the center of the card up to a maximum size of two inches. The card also has slots on the reverse side which can hold a 2" x 3" photo that will be partially revealed when the iris is opened. See the video below for a demonstration of the card.
The optional envelope is just a plain white envelope. The card varies in thickness, but is approximately .09" thick at its thickest point. See the video below for a demonstration of the card. This listing is for the fully assembled card; the kit version that needs assembly can be found here.
About Templates: I'll work on getting a better template selection for the future, but in the meantime if you want one of the designs seen in the video with only a change to the text or color you may select the template printing option.