1 x PM2.5 Anti-Dust Mouth Mask. -The cotton mask with ficters in them. Disposable Surgical Mask Anti-Virus 99% Filtration 3 Layer Filter Face Mask New. AU $3.00 + Shipping . -The mask has a filtering effect haze of 99.9% for you and enabling easy breathing. Note: 1: 1 Inch=2.54 CM; 1 CM=0.39 Inch.