This rubber duck-themed glass straw cup is made of food-grade high borosilicate glass, ensuring safe and healthy drinking. The cup body is printed with adorable rubber duck, sun, and butterfly patterns, along with clear milliliter markings, combining aesthetics and practicality to make drinking water a pleasant experience. The transparent flip-top lid with a stainless steel straw allows for convenient drinking directly or with a straw. It's easy to carry and spill-free, suitable for commuting, school, and home use. The smooth, rounded rim won't scratch your mouth, and the thickened, non-slip bottom makes it lightweight, easy to grip, and easy to clean without leaving any odor residue.