This invitation set comes with the petal fold card base, a large mat for color, and a mat to store the invitation details. The petal fold card base wraps within itself to house the invitation or you can place the entire thing into a standard A2 Envelope (4-3/8” x 5-3/4”) for mailing. The inside mats are approximately 3-1/2” x 5” and 3-1/4” x 4-1/2”. The file is compatible with both the 12x12 and 8x12 mats. You can find additional images and a full tutorial on my blog: http://jamielanedesigns.blogspot.com/2013/10/petal-invitations-and-place-card.html