This bronze mirror is 13cm in diameter, 1.2cm in thickness, weighing 930g. It has a button in shape of a crawling beast on its back. The decoration of grape grain patternon the back of the mirror is of three-dimensional effect. Except for a few rusting marks on the rim of the mirror, the bronze mirror is well-preserved, bright and clean in the texture of copper. It is an outstanding bronze ware of the Tang Dynasty for its exquisite technique.