Anti-Flu, with a filter encased in 3 layers of non-woven fabricsSo many sizes and colorsare available.Soft, Comfortable, Odorless, Breathable,No stimulus to human skin Filter pollen, dust and bacteriaUsed for clinical, housework, gardening, maintenance of the machine, etcLaboratories and factories for blocking liquid mists, harmful airborne chemicals and fineparticlesStandard mask size: 17.5cm*9.5cm Standard Ear loop Length: 17-18cmPackage: 50PCS/INNER BOX, 500PCS/CTN, 1000PCS/CTN, 2000PCS/CTNCustomer's logo can be printed onSize and color could meet customer's needs