The day-and-night stainless steel-made tumbler is a fantastic companion in drinking your beverage of choice. Each tumbler can hold up to 8 oz. of liquids and has an inner and outer that is made of BPA-free stainless steel. Be assured that your drinks will stay cold or hot as this tumbler is double walled. Do not worry about spilling your drinks as this tumbler sports a non-slip bottom and is covered using a snap-on sip-through lid. Keep this FDA-approved tumbler clean by hand washing it after every use.