I've used this for six months. I'm selling it now because I haven't been using it much lately. There is some blackening, partial stains, and blackening on the bottom due to scuffing. Please check the condition in the images. I will wrap it in bubble wrap for shipping. Please purchase only if you understand that it is used and has been stored at home. Thank you. From the manufacturer's website: We only use valuable straight-grained wood from Kiso Sawara (Japanese cypress) trees that are over a hundred years old. Kiso Sawara has excellent water resistance, and the straight-grained wood in particular has high absorbency. When you put freshly cooked rice in it, it absorbs excess moisture, bringing out the original flavor and sweetness of the rice, enhancing its aroma, and giving it a pleasant texture. Kiso Sawara is also highly acid-resistant, making it a very suitable material for a sushi rice tub that uses vinegar. Product size: Diameter 20.5cm, Height 14.0cm, Lid φ20.5 (Inner diameter φ18.5cm) x H4cm, Body φ18 (Inner diameter φ16cm) x H13cm / 305g Material: Sawara (Japanese cypress), copper Made by: Yamaiti, Kiso-gun, Nagano Prefecture Retail price: ¥22,440 (including tax)