Collage Mats or Multi-Hole Mats are mats that have more than one window opening in them. We have over 250 collage mats ready to design into with very standard sizes. Our stock collage mats range from having 2-13 windows. You can order just the mat or load it up with a frame, acrylic, and all of the necessary accessories to hang it on your wall. Like any other mat you purchase from us, there are discounts if you order multiples.