Each item in the XTRA Stainless Steel Vacuum Collection is made from quality material. They all have double walled stainless steel refills manufactured using modern technology to ensure they are durable and unbreakable. Double-walled stainless steel liner. Keeps hot and cold up to 24 hours. Practical screw stopper, spout system and handle made of premium quality chrome plated zinc alloy metal. Single-handed operation, for precise individual portions. Free of toxins for the healthy storage of foodstuffs. High-gloss surface and worldwide patented, designed in London. 10 years warranty on insulation function.