US Art Supply 12" x 18" GREEN/BLACK Professional Self Healing 5-Ply Double Sided Durable Non-Slip PVC Cutting Mat Great for Scrapbooking, Quilting, Sewing and all Arts & Crafts Projects Durable 5-Ply Self Healing Construction 1/2" grid with 1/8" marks for precise alignment as well as 45 and 60 guides. The green/black mats are reversible with grid markings on each side. Cutting mats also have lines for cutting diagonals Protect your table top from sharp blades, writing instruments and other art and craft tools.