... filtration efficiency.50pcs/box,2,000pcs/ctn. Surgical Face Masks3-Layer Face Mask,Elastic Ear Loop and Tie-on type;Specifications ... available:PP 18g/sqm, PP 20g/sqm, PP 25g/sqm; 3).Comfortable elastic ear loops,;Adjustable ties,dual head straps for ... ).Colours:blue,green,white;5).50pcs/box,2000pcs/ctn.Special 3-layer design respirator produced from high filtrable,fluid resistant with a ...