Piping Nozzles: Include 2D 1M 4B 1A Large Stainless Steel Icing Tip. Tumtanm piping nozzles are made of 304 high-quality stainless steel, Seamless, safe, and reusable. Large piping nozzles can be reused.They can be used with disposable piping bags,and you can also use them with Tumtanm couplers. They are easy to clean and non-stick pan. Read more.