What is the benin plaque made out of?

The Benin plaques, also known as Benin bronzes, are primarily made of a copper alloy, which typically consists of copper, tin, and small amounts of other metals. These plaques were cast using the lost-wax technique and often feature intricate designs depicting historical events, figures, and symbols significant to the Benin Kingdom. In addition to the bronze plaques, some pieces may incorporate other materials like ivory or wood for added detail or embellishment.