Mask Kleenex with attractive black design mask hygienic disposable 3 layers: Effective at 95% against particles up to 3 microns homologated masks Kleenex are designed for easy breathing, comfortable and adaptable to the face and nose package masks has a seal suitable for storage and transportation Each sales unit contains 18 packs of 5 masks, all 90 mask The mask Kleenex has Efficacy suitable Bacterial Filtration, BFE more than 95% and a breathability appropriate, Pressure Differential less than 60 Pa / cm2