1.surgical mask (1ply,2ply,3ply,4ply) 2.bfe>99% 3.weight:20+ ... and bacteria4.Used for clinical,housework,gardening,maintenance of the machine.etc5.Laboratories and factories for blocking liquid mists,harmful airborne ... ,green,blue availeStyleEarloop or On Tie 3ply Nonwoven Earloop Surgical Mask