On 13 March 2012, the United States requested consultations with China with respect to China's restrictions on the export of various forms of rare earths, tungsten and molybdenum. The request refers to materials falling under but not limited to 212 eight-digit Chinese Customs Commodity Codes and over 30 measures. The request also refers to a number of Chinese published as well as unpublished measures that, operating separately or collectively, allegedly impose and administer export restrictions.