This shape is laser cut from 1/8" plywood. This size is what is used by Artists as an "ATC" which stands for Artists Trading Card. An ATC is a small work of art which is completed by the Artist and then traded with other artists. There are no "rules" for the design other than that they be created on a 2 1/2" x 3 1/2" card. The concept of ATCs was developed in 1997 by M. Vanci Stirnemann an artist from Zurich, Switzerland.