The Tumbler by OZO &ndash; Premium Stainless Steel Vacuum Insulated Travel Mug, Hot or Cold Drinks with Straw and Brush, 16oz capacity, in Matte Black HOT/COLD: High efficiency, double wall vacuum thermo insulation. Keeps your beverages hot or cold four times as long as normal insulated cups. Condensation free. ECO-AWARENESS AND SAFE: Stainless steel cup, 18/8 inside, BPA and lead free, with stainless steel straw with smooth edges (not cheap plastic) and brush. Lid of mug seals tight to avoid spilling. LARGE CAPACITY MUG: Up to 18 Oz, best use 16 Oz STRONG CONSTRUCTION: for heavy duty use during your daily commute. SATISFACTION: our commuter mug comes with a 30 day money back guarantee, no questions asked