PME Stainless Steel Seamless Supatube Nozzles - Writing No. 1 Seamles Stainless Steel Icing Tubes Works well with almost all piping bags, including disposable piping bags. Ideal for writing messages, names, numbers, trellis and line work. Available in No. 0, 00, 1, 1.5, 2, 2.5, 3, 3.5 and 4