Self Healing Rotary Cutting Mat, Full 24x36, Best for Quilting Sewing | Warp-Proof & Odorless (Not From China) Cut Marks Heal in Seconds - Each cutting mat consists of 15 layers of self-healing compound, so it heals faster and the surface stays smooth for longer. Our mats are at least 25% heavier than those by Alvin, Olfa or Fiskars due to the higher material density produced by our proprietary manufacturing process Stays flat, Won't Warp or Crack - Our mats are made of sturdy, refined material that can withstand direct sunlight and will quickly recover even if not stored flat. Most multi-layer or thin boards can warp easily due to impurities in the material reacting differently to temperature and bending Certified Safe & Odorless - Compliant with EN 71-3, the newest European safety standards concerning Heavy Metals present in products children may come in contact with. We also eliminated VOCs so it won't stink up your room and there's no chemical residue left on your fabric and paper In Inches & cm, Double-Sided - Both Imperial and Metric guides are printed (one per side; see image 4), and we ensure the grid lines are accurate to help you measure and line up material easily Beginning Apr 2016, all our mats have full 24 x 36 grids - Ideal size for both beginning and seasoned quilters (especially if this is your first purchase) because you only need to fold yardage once and thus avoid those ugly 'dog legs' (grids: 24"x36"; thickness:0.1" or more; cutter & ruler Not included)