These double walled acrylic cups come in 16 ounce or 20 ounce and in 4 colors for each model. You can choose your size and color. These cups are an easy way to infuse any cold beverage you wish with balancing energies that will allow the body to function in harmony. The cups come with color coordinated straws. These cups can also be used with no liquid in them to energize the air you breathe when the straw is inserted into the fields of the gans materials.