... is spandex fabric)Special 3D design, make mask more joint face and big space for breath. Characteristic:1) size: 12.5X18cm ... , pink, blue, yellow etc. 6) advantage: Filter pollen, dust and bacteria, Very low resistance to breathing, Soft, Comfortable, Odorless, No ... stimulus to human skin. Good filtration efficiency, pollen, dust and bacteria filtration efficiency over 95%7) used for clinical, workshop ...