Professional quality for all kinds of graphic arts hobby craft shop and industrial applications these self-healing and reversible cutting mats are 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 desk blotter or general-purpose work mat. Self-healing reversible non-glare surface is 3mm thick and extra durable. Designed for both rotary knives and straight utility knives. Will not dull blades. Printed grid pattern includes guide lines for 45 and 60 degrees angles and 1/2" grid lines. All four edges are fully numbered and graduated with 1/8" hash marks that extend beyond the zero base line for convenience. Mat sizes 24" x 36" 30" x 42" and 36" x 48" include internal horizontal and vertical graduated hash marks. Non-stick surface is impervious to abrasions and liquid spills. Hanging hole for convenient storage. ALVIN cutting mats are available in four versions: GM Series - Green on both sides with printed grid on one side only. BM Series - Black with printed grid on one side grey without grid on the other. GBM Series - Green on one side Black on the other and both sides gridded. TM Series - Translucent with printed grid on one side only. Perfect for use with lightboxes or other see-thru applications.