1.Direct manufacturers to guanrantee reasonable price and excellent quality
2.4ply-5ply design to successfully prevent dust and bacteria
3.Packing 20pcs/box,1000pcs/carton, as well as can be per customers require
4.Certificates ISO/CE etc relative certificates & test reports.
5. we also have many other styles ,like no valve style, active carbon styles,adjustable ear band styles and so on…