Hangzhou Singer Building Materials Co., Ltd is the first company among the PVC rain gutter system filed who pass the IS9001:2008 Quality Management System and ISO14001:2004 Environment Management System. As a premise of large scale production, our company reply on the most international advanced technology and equipment, backed by technology innovation & development, with our own import and export operation rights, fully integrating global sources, winning a very high cost-effectiveness on the market. Then we really did that "same quality lowest price, same price best quality.