Kuber Industries Tuff Jug Flask is made from 100 percent virgin plastic with polyurethane foam inside double walled casing. This system maintains the temperature of the contents inside for longer duration. This is scientifically designed to retain hot/cold contents for hours. The inner mirror finish container is fabricated out of non-magnetic stainless steel. This is very useful durable and unbreakable and ideal to use at home office hospitals and picnic etc.