The Machalilla were the first cultural tradition in the Americas to produce bottles with a human shape. These ceramic vessels took various forms, including male and female, obese and thin, pregnant, and others. They also popularized the use of painted ceramic decoration, applying bands of black paint over white on their pieces. The paint was applied to the surface of earthenware vessels, which were usually highly polished, and even burnished, and in some cases the unpolished areas were decorated with incision and puncture designs. Notable stylistic aspects include the stirrup handle, which would later become very popular in several American ceramic traditions. The Machalilla also became highly skilled in gold, silver and copper metallurgy, working these metals in sheets and recorte pendientes and making earrings and other body ornaments.