Alvin's GBM Series Cutting Mat is ideal for graphic arts, hobbies and crafts, and industrial or shop environments. This durable, self-healing mat is made of three-millimeter vinyl that won't show marks or cuts and isn't damaged by spills. All four edges are marked with 1/8-inch graduated hash marks that extend beyond the zero line so you can be sure your measurements are accurate. Safely use rotary and straight utility blades without dulling them. Black on one side, green on the other; both sides have printed grids. Hanging hole for tidy storage.