Surgical Face Masks Packing: 1200 pcs/box 4 layers: - Outside: 2 PP layers - Inside with Flame Retardant: 1 layer Activated Carbon Fiber Non-Woven and 1 layer Meltblown Non-Woven Advantage: can be re-used 30 times to protect environment by: - Outside layer: can be washed again and again - Inside layer: can be heated by microwave oven