The Blender Bottle is No Ordinary Bottle Blender Ball Mixer InsideEasy-Grip DesignOunce and Milliliter Marking Stay-Open Flip TopEasy to CleanDishwasher SafeLarge Drink/Pour SpoutSecure Screw-On LidWide Opening For IngredientsFits in Most Car Drink HoldersNo Electricity or Batteries RequiredPatented Versatile Gourmet cooks have relied on the wire whisk for hundreds of years to blend their ingredients into a smooth and light consistency. Now you can do the same with the Blender Bottle! It"s prefect for mixing everything from creamy smooth nutrition shakes to salad dressings, marinades, and fluffy omelets. It also makes a great water bottle. Simply drop the BlenderBall wire whisk into the BlenderBottle along with your ingredients, screw on the lip, press down the flip top, and shake. The patented BlenderBall moves freely throughout the bottle as you shake, mixing the thickest ingredients with ease-it"s made electropolished surgical-grade stainless steel and is designed to remain in the cup until you"ve enjoyed the contents. U.S. Patent 6,379,032 - Patents Pending Additional note by iHerb: These Blender Bottles are made by Sundesa, the original manufacturer, and are BPA Free Read more about them at BlenderBottle.Com