Shanghai Svn Energy-saving Technology Development Co., Ltd. is an enterprise specialized in producing high-grade external roller shutters, and are one of the domestic leading large-scale manufacturing enterprises of external roller blinds. We hammer away at providing various high-quality sun-shading products for customers. By introducing overseas advanced technology, and using imported aluminum alloy profiles in original package, our company has always made efforts to recommend to customers with the world's most advanced residence concept, to raise the quality of life, and to make customers enjoy the new feeling brought by comfortable houses.