Self-healing cutting mat kit includes an 8.5" x 12" green cutting mat with hobby knife and spare blades. Printed grid pattern includes guide lines for 45 and 60 degree angles, 1/2" grid lines and all 4 edges are fully numbered with 1/8" hash marks that extend beyond the zero base line. Great cutting mat/knife for modeling, crafts, hobbies, more. Alvin #GMK812 hobby knife and self-healing cutting mat kit. E-MAIL FOR QUANTITY DISCOUNTS.