Dragon picture. Longtu is Longtu Energy Saving Aluminum Co., Ltd., a wholly foreign-owned enterprise invested and established by Longtu Aluminum Co., Ltd. of Hong Kong, China. It is a manufacturer of aluminum profile products designated in mainland China. It is genuine, and Longtu is a trademark registered by a merchant. . The company is located in the Economic Development Zone of Langxi County, Xuancheng City. The company has a total investment of more than 20 million US dollars and has three factories.