Kingray New Materials Science & Technology Co ., Ltd , is a hi-tech public company established by CRIMM ( Changsha Research Institute of Mining and Metallurgy),a hi-tech enterprise under the Central Government. Kingray has more than 20 years' experiences in developing and producing synthetic diamond and enjoys good fame in the domestic superhard materials field for its strong developing force , advanced techniques , strict quality control system , high prestige and perfect sale-after service. The company owns 150 sets of cubic-type presses, including 72 sets of 400mm and above, with a capacity of 80 million ct per year of KRD series products . Moreover , the company can produce 5 million sets of pyrophyllite compacts , 12 million pieces of conductive steel rings and 100 tons of carbon chips per year.