Masks are designed to protect the human respiratory system from dust and suspended particles in the air, as well as from possible infection with infectious diseases. The valve provides unhindered breathing. Protection is achieved by the presence of additional cotton filters and a layer of meltblown. Designed for single use. The presence of a cotton filter and a layer of meltblown. Earhooks: urethane elastic fiber, white, 16.5 + / 1 cm, ultrasonic welding Flexible nose clip.