Bon Chef 3 wall cold wave miracle platter with hammered design. Pre-freezing the platter for 4 hours will help maintian safe food temperatures for several hours. Outer air chamber prevents the platter from creating condensation while keeping the inner chamber gel frozen. Great product for your next picnic or party requiring no ice to keep your food cold. Handling instructions: Never place your Cold Wave platter in an oven, microwave or any other heat source this may damage your platter. Dish washer safe or hand wash. Never use abrasive scouring pads or cleaners. Always add food that is pre-chilled to proper temperatures.