Topseller Chemicals Co., Ltd, a subsidiary company of Shandong Tralon Group, was founded in 1990. Topseller is the only largest synthetic detergent specialized manufacturer in north China now.Located in Longkou, Yantai City, Shandong Province, it enjoys convenient transportation. Our company has about 600 employees. The factory area covers 100,000 square meters and over 20,00 square meters of warehouse space. TSL is one of the largest and most professional OEM/ODM detergent supplier in China.