GreenSun is one of the brand which was created by Ching Sum MFG. (Dongguan) Ltd. was originally founded in 1981 in Hong Kong. In 1993, we were relocated from Hong Kong to Dongguan with an area of 60,000 square meters. We hadaccredited to ISO9001 in year 2003. Ching Sum had great experience in molding, processing and plastic injection equipment, since decades of excellent experience of servicing the US market, European market . This is why our customer has confidence and trust in our company.