Spritech(TM) 5 Pcs Fashion Warm Cotton Bowknot Deaign Mask Anti Dust Mask Anti-fog Mask Earloop Face Mask Safety Respirator Particle Respirator Color Random Color: Random Masks are reusable cloth masks that filter out airborne dusts, allergens, spores, dander, germs, bacteria and viruses!?Fabric is made of Polyester / Cotton blend and treated with a germ killing Mask that specializes in PM2.5 measures Medical research shows that the respirator use time can't more than 3 days, otherwise the bacteria, lead to many diseases.5 piece masks easily solve the problems.Convenient and affordable Size:9.8"*4.9"/25*12.5cm