Ningbo Yinzhou Sonjin Industrial & Trading Co., Ltd is the biggest designer and manufacturer of roof windows and accessories in China mainland. We have been in the line of developing roof windows business for more than 10 years, product alomst have coverd all over the world.All our products and their quality control system are carried out according to the European standards.CE certificate, Salt-spray test, VOC test and some other professional test result will give you more high guarantee of quality.Strengthen management, elaboration, continuous improvement and customer satisfaction is our quality principle we will pursue and achieve. Competitive price, best service, high quality is our promise we will keep for ever.Profession create success,Ningbo Sonjin will be your best choice!