Helimix 2.0 Vortex, Yellow, Portable Pre-Workout Blender Shaker Bottle uses utility patented technology to mix your shakes without the need for annoying agitators bouncing around inside. The shape of the cup itself does the mixing and it works way better than you think. Forget the days of cleaning shaker balls and screens, trying to untangle them from the dishwasher rack, losing them in your cabinets, or replacing batteries. Helimix is responsibly Made in the U.S. with 100% American sourced 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.