Our Stainless Steel Tumbler is made from 18/8 food grade stainless steel, which is durable, electro polished on the inside to ensure your cups remain rust-free, and colored powder coated finish on the outside make it super easy-grip. comes with a sliding lid for spill-proof and a reusable straw to help you stay neat. the wide mouth opening allows easily washing and quick filling. this 26 oz tumbler set is designed for everyday use at home, in the office, outdoor parties and events.