Chirori is a metallic pitcher that is immersed in hot water to warm sake. Generally, it is cylinder-shaped like a tall cup with a narrow circular or oval bottom, attached with a spout and a handle. Mainly there are 1-go and 2-go types. Chirori is also known as sake tanpo. Though made of silver, copper, tin, brass, aluminum, or other various materials, tin has been preferred from ancient times to serve sake because it is resistant to rust and corrosion and many tin chirori have been sold as gifts. Recently, there are also chirori made of heat-resistant glass.
To use a chirori, first you put as much sake as you like in the chirori, then immerse it in a vessel such as a sake warmer or sake pot filled with hot water, and heat it to your favorite temperature. At a place having irori (a Japanese hearth) or hibachi (a Japanese heating device), the chirori may be buried into ashes to warm the sake.