This protein shaker bottle is made from kitchen-grade stainless steel, which helps prevent the absorption of odors and stains that often occur with plastic bottles. The double wall vacuum insulation keeps cold drinks cool for an extended period and hot drinks warm for many hours without condensation forming on the outside. The twist-on lid creates a reliable airtight seal to avoid leaks during shaking or when the bottle is placed in a gym bag. Inside, a wide mouth allows for easy addition of protein powder or liquids, and an engraved scale helps with measuring water amounts. 2 mixing balls are included: a silicone ball that operates quietly and is simple to clean, and a plastic ball that blends quickly for smooth results. Both work effectively to break up clumps and create even mixtures. A comfortable rubber strap on the side makes the bottle easy to carry, and the stainless steel body resists shattering if accidentally dropped. Cleaning is straightforward, as the bottle is dishwasher safe, though hand washing is recommended to maintain its finish. This shaker bottle works well for protein shakes, prelockout drinks, or even hot beverages, and it suits fitness enthusiasts or anyone looking for a durable, reusable bottle for daily use. Color: Black.