<br>COYOAL 20 oz Stainless Steel Tumblers are good at: <br>1. the COYOAL tumbler is made of 18/8 stainless steel, with double-walled insulation, so your drink will stay hot or cold for hours. <br>2. Each tumbler comes with a BPA-free sliding lid . <br>3. the press-in sliding lid is tight-fit, creating a splash-proof seal. Never worry about spilling on your front shirt anymore! <br>4. the tumblers are made to be durable and reusable for years, so why not replace the plastic cups with these for an eco-friendly life! <br>Here are some tips for you: <br>1. Please do not freeze or microwave. <br>2. Hand wash the tumbler before first use and after each use. The sliding piece could be taken off for washing. <br>3. After pouring in boiling water, let it cool down without the lid for at least 3 minutes. <br>4. Please leave some space at top of vessel for lid to avoid overflow. <br>5. Always keep the tumbler away from children when filled with hot liquids.