Round nozzle
These nozzles are used commonly for filling purpose and to give a simple and elegant look to cakes and pastries. They are often used for toppings on cupcakes, cold coffees and other desserts. They do not have any edges or carvings and are simply plain round in shape.
Star nozzle
The star nozzle creates the most celebrated, easily accomplished decorations! The serrated edges of the star tip makes ridges in the icing as you squeeze it out. Different sizes are available in star nozzles, which can be used for different purposes. Also, shapes can be changed by altering the amount of pressure given on piping bags.