The Cooks Innovation SimmerMat heat diffuser gives you perfect heat control to achieve that long, slow simmer you need to make perfect sauces, chili, melted chocolate, and so much more.Prevents hotspots by spreading heat evenly under the base of the pot, so there's no catching, burning or spoiling. Made from zero-carbon enameled steel with an enamel exterior finish. Works on all cooktops. Can also be used as a slow cooker, rice cooker, or double boiler. Measures 7.75" W x 7.75" L. Dishwasher safe