Highkeyexcellence products are made with carefully selected materials. Please handle with care for longer product life. Lightly tap the top to see the temperature, of hot or cold liquids put into our highkeytek bottles HighkeyTek's double- wall vacuum insulation helps contains any liquid temperature for up to 12 hours. Stainless Steel- We ask to only use non-abrasive cleaners and sponges. Hand wash only Do not microwave