... , 15x9cm, 16x9cm, 17.5x9.5cm non-woven face mask, 2-ply, 3-ply, 4-plySanitation and quality in accordance with CE, ISO9001, ISO13485 ... dust6) Used for clinical and workshopSpecification:1) Material: 2-ply 20gsm PP + 25gsm PP3-ply 20gsm PP + 20gsm filter paper+ 25gsm PP2) Size ...