Round Polypropylene Piping Tip 60 x17mm: Thermo Plain Piping Nozzles 60x 17mm: Thermo hauser Polypropylene Piping Tips are the ultimate piping tips for craft bakers. They do not allow you to simply push product through a shaped hole, the thickness of the material lets the hole shape run up inside the tip allowing you to make an accurate and parallel extrusion that will give you precise and consistent high quality results