These beautiful mugs are made by our lovely potter right here in Massachusetts. They are completely hand thrown and are fired in a high fire gas kiln, making them extra durable. We have a granite counter-top and have lost many mugs to it before but I have yet to break one of these mugs on it. Each mug holds a different amount of liquid because they're handmade but this one holds 12 oz. These mugs are microwave and dishwasher safe and non-toxic.