This is a favorite sencha tray (kyusu tray). It's an old piece, so it has wear and tear commensurate with its age, but I think that adds to its character. The material is unknown, but it seems hard and durable. Diameter: Approximately 18.3cm Height: Approximately 1.4cm Sizes are approximate. The actual item may differ slightly in color from the images. It's an old piece, so it has wear and tear commensurate with its age.