Ancient Chinese objects used as mat weights. To keep mats in place, heavy artefacts called Zhen were put on the four corners of the mat. Near the main coffin of the Zeng Hou Yi Mausoleum, four hemispheric bronze Zhen were unearthed. They are hollowed and its top is decorated with a dragon-shaped knob hooked with a ring. Eight dragons intertwin and fourteen small rings are cast onto each Zhen.