Optical brighteners are divided into many types,such as OB, OB-1, CBS-X, FP-127, ER-I, ER-II, KCB, KSN, etc. They are widely used in plastics, textiles, printing and dyeing, washing, paints inks, and other industries. We can provide different packaging according to customers' requirements to save shipping costs. If there any interested in our products,please feel free to contact me.