4.[Airtight and Leak-Proof] Twist open lid for a tight seal and no leaks. It is easy to open and close. 1.[ Stainless Steel] The is made of premium stainless steel material, which is sturdy and easy to clean. This drink cup is safe, odorless and safe to use 2.[Easy to Use] This drink bottle is equipped with a large and round stainless steel spring, which is easy to mix your protein drinks. 3.[Large Capacity] With 500ml large capacity. It is single-layer with scales on the outside of the bottle, easy to see the amount of drink. It is a good helper when sports. 5.[Widely Uses] This portable protein shaker cup is suitable for gym, hiking, biking, camping, or use it at the office. It is suitable for coffee, smoothie, juice, cocktail and other beverage. It is also used as a daily water bottle.