... 5.laundered under ISO Class 5 specification:disposable paper face mask paper face mask disposable high performance carbon has high filtration efficiency ... Description Model Product name EI Cleanroom Face Mask(Earloop) Size 17.5*9.5cm/15*9cm Colour ... Shenzhen Payment L/C,T/T Features:1, non-woven face mask with high performance carbon has high filtration efficiency 98 ...