3-ply nonwoven face mask has high filtration efficiency 99% . Ideal for hospital,dental,cleanroom,food preparation and industri Material:PP/spunbond fabric&melt- blown 22+bfe≥99+26gmrssize:17.5*9.0cm 21*9.0cmcolor:white/blue/pink/yellow/green50pcs*40box/2000pcs/ctnctn size:52*38*34cm medical mask face mask with era loop(machine-made)