1.surgical mask (1ply,2ply,3ply,4ply) 2.bfe>99% 3.weight: ... NELSON test standard and CE,ISO standard.2.Mini-fiber high electrostatic filter,filtration efficiency of dust & powder is over99 ... is water resistant.4.Polypropylene cloth,low breathing resistance and high filtration effciency.5.Latex free,lint free,fiberglass free, ... ,green,blue availeStyleEarloop or On Tie 3ply Nonwoven Earloop Surgical Mask