Just gently squeeze on your icing bag(not included), it will produce frosting from the the tip and you can easily create the grass or fur look on cakes cookies cupcakes on your own. Specifications Quantity: 3pcs Material: 304 Stainless Steel Nozzles Includes: #233; #234M; #234 Size: 18 25 10mm; 24 29 13mm; 25 40 17mm Effects: Grass / Hair / Fur / Flower Center / Nest and More.