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.Will not dull blades. Printed grid pattern includes guide lines for 45° and 60° 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. The larger mat sizes 24" x 36", 30" x 42", 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. 30 x 42 mat is printed on one side only.