This professional quality self-healing and reversible cutting mat is 3mm thick and extra durable. Made from a unique composite vinyl material designed for both rotary blades and straight utility blades, they provide a long-lasting, non-glare surface that can be cut and slashed constantly without showing marks or cutting lines. Can also be used as a small desk blotter or general-purpose work mat. Find the perfect center on any project with zero centering lines. Cutting mat is green on one side, black on the other, with a middle layer of hard vinyl with self-sealing qualities. Both sides have graduated grid lines, including guide lines for 45 and 90 degree angles. The non stick surface is impervious to abrasions and liquid spills.