Great gift for yourself and your better half--even if he is a bit of a monster before he's had his morning cup of coffee. This mug set was created from stoneware clay, kiln fired twice to 1900 degrees. It was made using all lead free, non toxic, eco friendly materials. This piece was created for you to use and enjoy on a daily basis!. Dishwasher and microwave safe. Mugs measure 3.5 x 4 and holds 14 oz.