... filtration efficiency.50pcs/box,2,000pcs/ctn. Surgical Face Masks3-Layer Face Mask,Elastic Ear Loop and Tie-on type;Specifications:9cm ... 18g/sqm, PP 20g/sqm, PP 25g/sqm; 3).Comfortable elastic ear loops,;Adjustable ties,dual head straps for tight facial ... : restaurant,food processing,factory,surgery,pharmacy,electronics,beauty salon,etc. Surgical face mask