The new BlenderBottle SportMixer fuses form and function to deliver unparalleled mixing in a sporty new bottle. Blend up protein shakes, energy drinks, and nutrition supplements with ease. Patented BlenderBall Wire Whisk Mix it Smooth - Every time the patented BlenderBall wire whisk is the secret behind the SportMixer's power. Add your ingredients, drop in the BlenderBall, and shake. The BlenderBall whips around inside the bottle, mixing your drinks to a smooth and light consistency every time. Made of 316 surgical-grade stainless steel, the BlenderBall is designed to remain in the bottle until you've enjoyed it's contents. Just drinking water? Feel free to leave the ball inside - it'll never rust, chip, or peel.