Quilting Bee&reg; 12"x18" 2-in-1 (Green/Blue) Self-Healing Cutting Mat for quilting, crafts and scrapbooking. Use with rotary cutters, x-acto knives and cutting blades. (CM1218) TWO MATS IN ONE. One side is a green mat with yellow grid lines and the other side is a blue mat with white grid lines. Useful in bright and low lighting situations. SELF-HEALING. Automatically reseals surface cuts to give you a continued smooth cutting surface. DURABLE & LONG-LASTING. This mat is a full 3mm thick and was designed to perform well for many projects to come. FULL 12" x 18" GRID. More working surface than other similarly-sized mats. SATISFACTION GUARANTEED. Quilting Bee&reg; stands behind our products with a 10-year guarantee.