Self Healing Cutting Mat Double Sided Durable 5-Ply 12" x 18" (A3) Mat size: 18 x 12inches, Grid size: 17 x 11 inches, thickness 3MM. Perfect for small, medium and large craft and sewing projects ACCURATE CUTTING double side with inch grids and different angles 3045and 60 that will greatly help the cutting process PERFECT GIFT for CRAFTERS and HOBBYISTS. Highly RECOMMENDED by crafters, quilters, and hobbyists UNIQUE SELF HEALING properties protects your craft knives, straight cutting blades, rotary cutter and work surface. Re-seals after every cut Constructed using 5 layers of PVC plastics to provide maximum healing capabilities which prolongs the life of the mat, and allows cuts to virtually disappear. The outer plies are 0.1mm + 0.9mm thick and give the mat self-healing properties. The inner core is 1.0 mm thick and prevents mat cut-through and extends your blade life. No scratches. Get a smooth surface even after many uses, every time.