non-woven face mask characteristic: disposable,safe use suitable size: 175 x 93 mm, 3 layers, filter paper inside Non-woven mask---efficient ... ,safe use suitable size: 175 x 93 mm, 3 layers, filter paper inside packing: each unit packed in a polybag, with ... ctns (600,000 pcs) delivery time: 20 days Non-woven face mask