I was all set to buy these mugs until I got to the post that said they were lined with nickle for "safety"! Copper is NOT toxic, however nickle is to many! They even sell nickle free earrings for crying out loud because of so much sensitivity to the metal! Copper, on the other hand has been used in water pipes for decades safely! Pans, pots and other wares have been safely used made of copper! Why, why, why did they line them with nickle??!!