ABOUT US Sino Seiko Co., Limited (SINOSEIKO for short) is a trading company that specializes in trading of Polycrystalline Diamond (PCD) and related products. Sino Seiko Co., Limited was founded in 2019 in the city of Zhengzhou, the capital of Henan province, in the heartland of China. SINOSEIKO is devoted to satisfying customers with premium quality products and customized service. Relying on local strong R&...