Helimix uses utility patented technology to mix your shakes without the need for annoying agitators bouncing around inside. As with any shaker, add liquid and then supplements to prevent anything from sticking to the bottom while mixing. Responsibly Made in the U.S. with 100% American materials. Helimix's graduated scale markings on the side of the cup range from 4 to 20 ounces. With the lid on, filled to the brim, Helimix can hold 28 ounces of liquid. Helimix will effectively mix in the range of 16 - 20 ounces of liquid at a time while remaining compact enough to fit in the vast majority of cup holders.