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 countertop 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 style generalls holds 12 oz. If you would like to know specifically about one mug just let us know! These mugs are microwave and dishwasher safe and non-toxic.