The device has a straight tube shape, with a flat bottom, attached by a half ring handle under the rim. The device is decorated with dragon pattern and cloud thunder pattern. The inscription on the inner surface of the instrument contains 44 words, arranged in 7 lines, describing that King Zhou rewarded the maker Zhao “Fang Wu Shi Li” (50 square li) (one li=0.5 kilometer). Throughout the inscription, the scripts are arranged vertically not horizontally; the strokes are distinctive, reflecting the obvious sense of lifting and pressing in the process of using the pen.