The "Top Up" shaker is made of food-grade 304 stainless steel, which is the best option for storing food and drinks. Thanks to the chosen material, the shaker is lightweight and very durable at the same time, so you can use it in the gym and beyond without fear of damage, dropping, or shaking. There is a volume scale on the outside of the shaker, which will help you mix the cocktail in the right proportion. The mixture will be smooth thanks to the spring ball for shaking, which is also made of steel. "Top Up" can be washed in the dishwasher, making it much easier to care for the product. Note: metal utensils should not be used in the microwave, so do not use the shaker in microwave ovens. The actual volume of the shaker is 700 ml, but we recommend pouring no more than 500 ml: the free space in the shaker will allow your cocktail to mix better.