This is a wooden container used for making sushi rice. The material appears to be "sawara" (Japanese cypress). There are two copper bands, but they are discolored and warped. Dimensions (approximate, measured by hand) Outer diameter: approx. 33 cm Inner diameter: approx. 32 cm Thickness: approx. 1 cm Ships on weekends via Rakuraku Mercari delivery service. You can apply to purchase directly if you have no questions.