1. 3-ply face mask got CE certificate 2. Ear loop/Tie on 3. with ... .4-ply,3-ply, 2-ply, 1-ply 3-ply face mask have been gotten the TUV certification and BFE has reached ... stimulus to human kin5) filter pollen, dust and bacteriaSpecification:1) Material: 3 ply 20/25g PP + 20/25g filter +20/25 ... accordance with CE,ISO9001 standards, very low resistance to breathing non-woven 3-ply face mask best