The Wilton 24 pcs disposable decorating bags can be used with or without a coupler and work great for microwave-melting and piping Candy Melts, Buttercream and Royal Icing. Fits standard tips and couplers. Just use, then toss! They are perfect for using with the cake icer tip. You can use these bags with all types of icings and fillings. Great as disposable pastry bags go – no cleanup.