Size 17.5cmx9.5cm, 50pcs/box,
advantages: very good ventilation; able to filter toxic gases; can keep warm; can absorb water; can be waterproof; flexible; will not be disheveled; feel very good and quite soft; Compared with other masks, the texture is relatively light; it is very elastic and can be restored after stretching; the price is relatively low, and it is suitable for mass production;
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