Using these pastry nozzles is easy. First, choose the nozzle you want for the design. Fit it onto a piping bag filled with cake cream or fondant. Then, gently squeeze the bag to pipe the icing onto the cake or other items. When you're done, clean the nozzles right away with warm, soapy water. Make sure to dry them thoroughly to prevent rust. Keep them in a dry place, and they'll be ready for your next baking project. Avoid using abrasive cleaners as they might damage the nozzles.