non-woven face mask, various type 2-ply, 3-ply, 4-ply, ... and tie-on size: 14x7cm, 15x9cm, 16x9cm, 17.5x9.5cm non-woven face mask, 2-ply, 3-ply, 4-ply Sanitation and ... clinical and workshopSpecification:1) Material: 2-ply 20gsm PP + 25gsm PP 3-ply 20gsm PP + 20gsm filter paper+ 25gsm PP2) Size: 17.5x9 ...