... face mask,earloop & tie-on; 9.0cm X 17cm;Low breathing resistance with high filtration efficiency.50pcs/box,2,000pcs/ctn. Surgical Face ... Masks3-Layer Face Mask,Elastic Ear Loop and Tie-on type;Specifications:9cm X ... irritating effects of nuisance odor,acid gas,hydrogen fluoride and ozone.Suggested applications: restaurant,food processing,factory,surgery, ...