Material | Stainless Steel. Tervis has been the leader in customized and personalized drinkware since 1946 and now they are taking the category they created and are revolutionizing it once again with stainless steel tumblers featuring colorful, expressive designs by Tervis. They're the new way to get the increased level of performance and functionality that stainless steel offers, and, for the first time ever, they can be enjoyed with legendary and beloved exclusive Tervis designs. This 20oz stainless steel features a Seminole Head Seminoles design. Hand wash with soap and water. Use scratch-free sponge. Do not use bleach or chlorine.