R&D, manufacturing, sales, and service of passenger car tires, light truck tires, truck tires, engineering machinery tires, agricultural machinery tires, run-flat tires, and coated punctured self-sealing tires; sales of passenger car tires, motorcycle tires, special tires, inner tubes, pads, capsules, wheel hubs and other rubber products and accessories; self-operated and agent import and export business of general business project commodities.