Trueware SOFIYA Ruff Tuff Flask Jug is made of high grade plastic and stainless steel material. Its stainless steel body on the inside and high grade plastic body outside which makes it a highly utility leak proof flask, which keeps the beverages/liquids hot or cold for 8-10 hours. This is very durable, long-lasting and attractive. This flask can keep piping hot tea, coffee, hot beverages, soups hot/cold for long time.