The mexican cantaritos are the best mugs that fit great in the hand and keep drinks cold or hot because the temperature doesn't change fast in clay. Ideally, when the pieces are received, let them soak in water for a few hours or, if possible, overnight. The next day they must be dried, and they will be ready to be used. If you choose to wash the cups with soap, you have to let them soak for a while in water. After, cups should be ready to use. Cantaritos are ready for use and certainly to add a bit of Mexican style decor to any table setting or folk kitchen.