Trudeau's 4-piece reusable decoration set contains everything you need to decorate cakes, muffins and cupcakes in no time. The set includes a 12" reusable silicone decoration bag that is easy to fill, a standard and a medium coupler for metal tips and a #16 star metal tip. The couplers feature the QUICK system that allows you to change the tips easily and quickly saving you time and energy. They are compatible with most standard metal tips allowing you to use the tips you already have at home. The kit is BPA free and dishwasher safe. What more could you possible ask for!