Plastic 6 Count 6 Ounce Margarita Glasses Plastic 6 Count 6 Ounce Margarita Glasses. 2-Piece Plastic Margarita Glasses Each Glass Measures 3.25 inches Diameter, 4 inches Tall. Holds 6 Oz. Clear. Shrink Wrapped in Plastic. Durable Polystyrene Construction.