Chang Yong Construction Co., Ltd. specializes in the manufacture and export of ducts for electronic and communications cables. Established in 1999, the company produces an extensive range of protective tubing on an OEM basis and under its own brand.  All of the company's protection ducts are made of high-density polyethylene (HDPE), which is durable and temperature tolerant to withstand extremes of cold. The ducting exteriors are ridged for strength and to maximize their surface area, which ensures that they can withstand a high degree of soil pressure. Reflecting their quality, the company's products have received ISO 9001 certification from Certification International (UK) Limited and have been approved by the Korea Plastic Testing Institute.  Chang Yong Construction Co., Ltd. is a privately owned company with registered capital of US$77,000 and total investment of US$1.2 million. The company employs a workforce of 14, including 4 engineers and 1 quality assurance staff. Annual revenues are around US$3.5 million, with the majority of exports destined for North America, Europe, and the Asia Pacific region.