Petal nozzles can be used to make realistic flower petals, drapes, swags, bows & ruffles.Metal tips can be used with decorating bags of any kind. All standard size decorating tips can be used with a Wilton standard coupler. A coupler is a two-piece device that fits onto your decorating bag and holds the decorating tip in place. Its a great convenience when you want to change decorating tips without changing bags, such as when you are using different tips with the same colour icing. The coupler base goes inside the cut bag to hold the tip in place, while the coupler ring twists around the base on the outside of the bag to attach the tip. Just twist off the ring to change tips.Features:Create beautiful realistic flower petals, drapes, swags, bows & rufflesPerfect for decorating cakes, cupcakes, and other baked goodsMade from high-quality, durable nickel-plated brassRust-proof for long-term useThe tip works seamlessly with standard piping bags and couplersDishwasher safe