Enamel on Steel Kettle made of lightweight carbon steel. Vibrant porcelain enamel is non-reactive and nonporous. Resists stains rust scratches and flavor absorption. Fixed single-tone whistle alerts when water is boiling. Markings inside kettle note minimum and maximum water fill levels. Compatible on all cooktops including induction. Mugs made of premium stoneware. Glaze is resistant to chips scratches and stains. Superior heat retention. Freezer oven microwave broiler and dishwasher safe. Includes: Demi kettle. 2 Stoneware mugs.