Helimix uses utility patented technology to mix your shakes without the need for annoying agitators bouncing around inside. 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.