More back -to-school fun with double-wall insulated food containers. Perfect for those hot (or cold) school lunches. Extra wide mouth is easy to fill. Keeps contents hot or cold for hours. Cool to the touch with hot foods and sweat-proof with cold foods. Both the interior and exterior walls are made from #304 Stainless Steel. Cap is made of recyclable HDPE#2. Hand washing recommended. Conforms to or exceeds U.S. and European safety standards. Food jars are 11.5 oz (350 ml.). 5.5" H x 3.5 "W.