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 of electropolished surgical-grade stainless steel and is designed to remain in the cup until you've enjoyed the contents.
WARNING: Not for use with hot liquids. Hot or warm liquids (and other ingredients such as pancake batter, soda, etc.) may build up pressure within the bottle and cause flip top to open unexpectedly and spray contents. Open flip top with caution.