Skull Floral 20 oz tumbler. Most of us have a beverage in hand all the time. These stainless steel double walled tumblers are safe, durable and will keep your drink either cold up to 24 hrs or hot for up 4 hrs with its sweat free vacuum-insulated design. With a sliding lid and straw included. Environmentally friendly alternative to disposable bottles and cups. CARE INFORMATION; 1. Tumblers are hand wash only. (lid is dishwasher safe, I do remove the rubber gasket) 2. Do not microwave or freeze. 3. Don't leave in a hot car or sun for an extended period of time. If properly taken care of these tumblers will last forever.