Cupcake Creations 990-1 9901 Disposable Duet Icing Bags, 12-Inch, 20-Pack, Clear Two compartment replacement bags keep icing separated until it's time to pipe Set of 20 dual chamber 12-inch replacement icing bags Ability to change the nozzle without having to change the bag Made exclusively for use with the Icing Duet Coupling Set Professional results in the home kitchen