Tungsten Mini Thermos 12oz A 17 oz Mini Thermos with Stainless steel strainer. Keeps Liquids hot or cold for 12 hours. The Tungsten on the outside offers unique advantages over its stainless steel counter parts. The tungsten Alloy is very hard and will not bend or dent when dropped. Offers many significant advantages over Stainless Steel Water Thermoses Sleek Design for everyday functionality. Fits in most Cup holders