... 16x9cm, 17.5x9.5cm non-woven face mask, 2-ply, 3-ply, 4-ply Sanitation and quality in accordance with CE, ISO9001, ISO13485 ... ) No stimulus to human skin5) Filter bacteria and dust6) Used for clinical and workshopSpecification:1) Material: 2-ply 20gsm PP ... enterprise, the chemical enterprise, the painting workshop, the leather industry, and the environmental sanitation unit. we also can pack it ...