Cake Boss Countertop Accessories 1.5-Quart Double Boiler, Stainless Steel: * Durable stainless steel * Impact-bonded base with layer of aluminum * Clever double-wall interior water chamber * Fill through the top of the handle with included funnel * Water level indicator window * Whistles when water needs to be refilled * Comfortable handle * Flared rim for easy pouring * Quality assurance guarantee