This Olfa Cutting Mat double-sided mat has 24 x 36 inch area with 1 inch white grid markings on a navy background. The mat itself is 1.5 mm thick, and the edges have markings every 1/8 inch with precise 30, 45, and 60 degree angles. Self-healing finish reseals surface cuts, providing a continually smooth surface for all cutting projects. For use only with rotary blades; fixed-blade knives blade may damage mat.