The Blender Bottle Classic revolutionized the industry back in 2004 with its leak-proof seal, iconic design, and the Blender Ball wire whisk. Now, years later, it's still the best-selling portable mixer on the market. Why? Because it works.Mix up smooth, lump-free shakes by simply adding your ingredients, dropping in the Blender Ball, and shaking. The Blender Ball whips around inside the bottle, mixing your drinks to a smooth consistency, every time. Made of 316 surgical-grade stainless steel, the Blender Ball is designed to remain in the bottle until you've enjoyed its contents. Just drinking water? Feel free to leave the ball inside - it'll never rust, chip, or peel.The Blender Bottle Classic features a wide mouth opening, embossed ounce and milliliter markings, and fits in most cup holders for added convenience.