This model is a print ready version of a Guiro Rasp, otherwise known as a Wooden Frog. These frogs make unique noises because of their hollowness. Just stroke the included stick along the ribbed back of the Guiro Rasp to make the noise! These models are unique because of their varied tones that can be created, all based on the size. This model is currently 4.5", however it can be scaled to your needs and with these sizes, can result in many different and unique sounds!!! Feel free to ask if you have any questions!