The Monster Energy Drink Ultra Fantasy Ruby Red Zero Sugar is a 500ml pack of 12 energy and fitness drinks, perfect for those looking for a sparkling and allergen-free beverage. This British-made product from the popular Monster Energy brand is low in calories due to its zero sugar formula, making it a great option for those watching their diet. Each unit is filled with 500ml of ruby red coloured drink, providing a burst of energy to help you through your day.