Rhinestone Diamond Bling Tumbler 20 oz stainless steel, insulated with straw (silver). The Rhinestone tumbler is made of 304 stainless steel, it is very beautifully made and eye catching. Suitable for every occassion, home, office, car, travel. Bling Rhinestone tumbler are gorgeous and stylish. The cup is made of 304 stainless steel. It is very beautifully made and eye catching. Easy to clean, hand washable.