Lately, Shandong Province published the list of first batch of champions of single items in manufacturing industry, in which 78 enterprises were included.

Among it, four tire enterprises in rubber industry were mightily included in this list with their respective products, which were respectively: Doublestar Group Co., Ltd. (casing of radial tire), Shandong Linglong Tire Co., Ltd. (semi-steel radial tire), Triangle Tyre Co., Ltd. (casing of radial OTR) and Prinx Chengshan (Shandong) Tire Company Ltd. (casing of radial tire for truck).