Rachael Ray Dinnerware Double Ridge 4-Piece Mug Set 4-piece mug set includes four 13-1/2-ounce mugs Quality stoneware dinnerware in colors for all kitchens, there is sure to be a stylish double ridge pattern just for you! The double ridge along the rim adds a casual and contemporary design element and look Great for every occasion from everyday needs to entertaining friends Pieces are microwave and dishwasher safe for easy cleanup and convenience