It is made of wood. As you can see, there is no discoloration, and the condition is very good. Size: Large: Bowl 12.2cm x 7cm Lid 11.4cm x 4.2cm Small: Bowl 11.7cm x 5.6cm Lid 10.8cm x 3.3cm Tea Ceremony Utensils Tea Kaiseki Kaiseki Utensils Small Round Bowls