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 beveragesliquids hot or cold for 810 hours this is very durable longlasting and attractive This flask can keep piping hot tea coffee hot beverages soups hotcold for long time Color Brown Material Plastic