Hunan Three-ring Pigments Co., Ltd., a large scale manufacturer in the iron oxide industry in China, has 52 years of history. The company covers an area of 7 hectares, and now has more than 400 employers. The annual production capability reaches 60,000 tons. Three-ringĄ¯s products are sold well to over 30 provinces and cities and are also exported to more than 30 countries.