Made of transparent and crack-resistant materials that are durable and sturdy. The lid features an audible snap function that ensures a well-kept and secured seal to prevent leakage and spilling. Great for salad dressings, condiments, sauces, candies, and even repackaging non-food items such as medicine, accessories, or any small items. These portion cups sauce cups with lids are designed to be freezer safe and stackable which saves you space when stored.