Yu Shuo brand. Yu Shuo (Xiamen) Trading Co., Ltd. was established on September 0 10, and its registered place is Taidong Road, Siming District, Xiamen City. Ys Mask is a brand product of Yu Shuo, which was released on March 2020 12. Mask is a sanitary and epidemic prevention product, which is usually worn on the nose and mouth to filter the air entering the nose and mouth to block harmful gases, smells, droplets, viruses and other substances. It is made of gauze or paper.