304 stainless steel square pipe is a type of tubing made from 304-grade stainless steel, which is a commonly used stainless steel alloy known for its excellent corrosion resistance, high durability, and aesthetic appeal.
Mask is a kind of sanitary product, which is generally used to filter the air entering the mouth and nose, so as to block harmful gases, smells, droplets, viruses and other substances, and is made of gauze or paper.