Trim photographs, collage materials, textiles, finished artwork or stationary safely and efficiently with this useful kit that includes both mat and a cutting knife. This small 5" x 7" mat is portable and great for on-the-go, ideal for artists, students, crafters and DIY makers. The mat protects surfaces from sharp blades, writing instruments and other art and craft tools. The double-sized cutting mat's resilient surface heals so completely that cutting leaves no visible trace, and repeated use actually prolongs the life of the knife blade. Art Alternatives Self-Healing Cutting Mat Set, 5" x 7" Gridded surface for precise alignment and measuring The mat is 3mm thick featuring 5-layer PVC construction Cutting knife features a safety cap and comes with three replacement blades (4 blades in all)