Functionality: Designed for mixing and shaking protein shakes or other beverages. Material: Typically made from durable and BPA-free plastic. Design: Usually equipped with a secure lid, a mixing ball or mesh to ensure smooth mixing, and volume markings for accurate measurements. Additional Information: The color "Black" suggests a sleek and neutral design. The 700ml capacity is a common size for protein shakers, suitable for most protein drink servings. Protein shakers are commonly used by individuals to conveniently mix and consume protein supplements or other nutritional beverages. If you have any specific questions or if there's anything else you'd like to know, feel free to ask!