* Conventional packing: 52*42*34cm , 400pis each carton
* material: four layers of material: one layer of water-repellent non-woven fabric weighing 50 grams, one layer of remelted spray non-woven fabric weighing 50 grams, one layer of hot-air cotton weighing 30 grams, one layer of water-repellent non-woven fabric weighing 5mm nose bridge, ear band
* Function: anti - dust, anti - bacteria, anti - smog and block droplets, blood, body fluids and secretions protection