Kaken Test Certified. Individually packaged for hygienic and easy carrying. This product has been inspected in Japan. Adopts a 0.2 inch (4 mm) fluffy ear cord, so it won't hurt your ears. Adopts ultra soft non-woven fabric that is gentle on the skin; Uses a 3-layer non-woven fabric filter that firmly complements milk particles, such as viruses, house dust, and bulk. The nose wire fits the lines of your face to reduce gaps. The three-dimensional pleat treatment reduces pressure on the nose and mouth, eliminating unpleasant breathing and chalking. The mask manufacturing factory meets the standards required by the world standard.