Cake Decorating Tip Covers - 4 per pack. Keep icings and fillings fresh and delicious with the Ateco 399 pastry tube covers. Simply attach this cover to the standard sized coupler on your filled decorating bags to prevent your delicious frostings from leaking or hardening at the tube crown. Perfect for bakeries and pastry shops, this set of four covers is great for refrigerating, transporting, or storing filled decorating bags. A great addition to your kitchen tools, these tubes covers will help keep your work space clean and organized.