 The boat is designated as Type 55A (55 Jia Xing, 55甲型).Instead of being wooden hulled, and having torpedoes as the main armament, the "Shantou" class is steel-hulled, with guns as the main armament.The "Shantou" (or "Swatow") is the predecessor of the Type 062 gunboat, or more commonly known as the Shanghai-I & II class.