Iron Gourd Outer diameter: 3.3cm x Height: 6.6cm Chain length: 17cm Weight (approx.): 210g Body: Cast iron Chain: 18-8 stainless steel When used for nukazuke (fermented rice bran pickles) or boiled with black beans, it results in vibrant colors. When placed in a kettle to boil water, "ferrous iron" is released.