This icing bag is ideal for use when piping a wide range of decorative materials including, buttercream, royal icing, choux pastry, creamed potato and cookie doughs etc. They are made from high quality polyester and are designed to last for many years. The fabric is easy to use, soft, lightweight and has strong reinforced seams for extra rigidity. They are dishwasher safe! They can be used with or without a coupler - instructions are included on the pack.