Biodegradability clay that was fired at 2200 degrees Fahrenheit for six hours makes it sturdy, durable, and chip-resistant for long use. Our products are made of premium clay and nature glaze, are lead and cadmium free, and this means that you will never have to worry about harmful substances leaching into your drinking or food. PREMIUM AND HEALTHY PORCELAIN 24OZ LARGE CAPACITY STYLISH DESIGN CHIP-RESISTANT AND DURABLE. LARGE CAPACITY.