Face Mask, Dust Mask, Masks 1.Maintenance free 2.Latex-free synthetic rubber head strap. 3.Staple free option Face Mask, Dust Mask, Masks Features1. ... custom seal for different facial sizes. 3. special 3-ply pleated design, high filtration and static electricity material to ... , partical filtration efficiency and the shape of mask according to customer's demand in details. Face Mask, Dust Mask, Masks