Cambro Seal Cover Only -- 2 per case.Ideal for use with Cambro food bars, buffet tables or for perishable condiments. Perfect for cold salad ingredients, butter pats or creamers. Keeps contents chilled at or below HACCP guidelines of 41 degree F (4 degree C) without ice. Freeze for eight hours or overnight before filling with pre-chilled product. Half and third-size pans hold contents cold for up to eight hours. Sixth-size pan and round crock hold contents cold for up to six hours. Made of high impact ABS material and filled with non-toxic gel.