FP-4P Flow Pencil is used extensively by Cake Artists, Bakers, and Home Bakers to decorate their Cakes, Cupcakes, Cookies, etc. The cake decorators dream, a mechanical piping tool so easy to use, "your hands would thankyou if they could talk". Made of food safe materials , easy to clean. 4 tip sizes to choose from , uses spring pressure. "No compressor needed" , take anywhere. Load piping gel , thinned royal icing , thinned buttercream , pressurize cup , pull trigger back....decorate.