Surgical mask 1) Made by ultrasonic machine. 2) Special 4ply pleated design/activated carbon flat. 3) The removal of bad odor and organic vapours. 4) Unique surface water resistant and soft lining ,non-irritating and fiberglass free. 4-ply nonwoven face mask has high filtration efficiency 98% and is ideal for hospital, dental, clean room,food preparation and industrial environments. They come in two primary styles, ear loops using a soft bandelastic or with ties made from spunbond. Standard colors are white, green, blue, yellow, or pink.