Okay. According to the inquiry on Dianping.com, the masks produced by Guangdong Lide Medical Supplies Co., Ltd. are good. Guangdong, referred to as Guangdong, is the capital of Guangzhou, a provincial administrative region of the People's Republic of China. It is named Guangdong because of the ancient place name Guangxinzhidong. Located to the south of Nanling, on the coast of the South China Sea, it borders Hong Kong, Macau, Guangxi, Hunan, Jiangxi and Fujian, and faces Hainan across the sea.