This reusable cup is made of food grade 304 stainless steel with internal and external polished, with a capacity of 500ml/16-ounce. No BPA and inodorous, rustless, prevent scratch and drop-proof. Comes with curl edge for comfortable sipping and increased durability for children. They can be stacked up together and save your space, and are convenient for you to storage and carry around. Suitable for both indoor and outdoor activities, such as birthday parties, home gathering, traveling, camping etc. 3 3/8" L x 2 3/8" W x 5" H