Add- A-Mat Rotary Cutting Mat: * Notches in the corners allow all the mats in the system to be mixed and matched as needed * This package contains one 12" x 18" self-healing cutting mat * It is double-sided with 1-inch gridlines on both sides-1/8" increments on the edge rulers-45-degree angle lines-and markings identifying 1/4- and 1/3-yard lengths * Additional mat sizes are available (each sold separately) * Imported