The heat insulation box is made of aluminum foil with plastic bubble.The aluminum foil forms an effective barrier against moisture,air currents and vapors. Characteristics: 1)Clean,thin and lightweight 2)Outstanding safety and environmental benefits 3)Cost-effective and versatile 4)Maintenance free Usage:It is an economical solution for a wide range cold drinks ,such as for packing ice cream,the foods needs colding and so on. Bubble model: 1)bubble:dia:10mm, H:4mm 2)bubble:dia:20mm, H:7mm