The treasure box, made of tin and oblate in a square shape, was the first painted treasure box discovered in the Forbidden City. The box was contained many things inside, including scriptures, coins, shoe-shaped ingots in five materials of gold, silver, copper, iron, and tin, gems in five colors, satins in five colors, silk threads in five colors, five spices, five medicines and five cereals. Such boxes were placed in the ridge cylinder in the center of the main ridge on the roof as an item for suppressing evil. During ancient times, placement of the treasure box featured a grand ceremony to pray for safety.