This jade ornament in the design of a monster mask was first found on top of the king's forehead. It is carved out of one whole piece of greenish jade. Its most unique feature is its unsymmetrical shape. The body of the ornament is a rectangular shaped animal head and a disc hang to the animal's nostrils. Hollowing-out, embossing and line-engraving techniques are applied to this work. The lines are smooth and the carvings are elegant.