... ties, 2 or 3 plies, 4.easy to use Face Mask Advantages :1)disposable ,single -use 2)economical ,light ,environment -friendly ... bacteria ,dust and coughingAdd information :surgical nonwoven high filtration face mask ,with ties ,3plies or 2 plies .nose bridge,suitable for ... oral ,dental procedures and other surgery/operationSize:9*17.5cm 40 boxes of 50 Disposable face ...