Made of high quality 304 food-grade stainless steel without BPA , durable, odorless, rust-proof, with internal and external polished, safe to wash and use in dishwasher,appropriate 16oz sizes for children and adults to hold tightly, suitable capacity for daily drinking, easy to stack without taking up too much space,can also be used for outdoor camping, tourism, hiking, beaches, picnics and so on, easy to carry around. 3 3/4" Diameter x 2 1/2" Diameter x 4 7/8" H