Four terracotta erbei drinking bowls, China, Han period (206 BC - 220 AD) Originally covered with a green lead glaze, these ear-shaped bowls have developed a beautiful iridescence over many years of burial. Length: 10.1 to 13.5 cm A few chips. This form, used for drinking wine, was made in a variety of different materials during the Eastern Han dynasty: bronze, jade, glass, lacquer and, of course, ceramics.