Güiro

The güiro is a Latin-American percussion instrument consisting of an open-ended, hollow gourd with parallel notches cut in one side. It is played by rubbing a stick or tines along the notches to produce a ratchet-like sound.

http://en.wikipedia.org/wiki/G%C3%BCiro

## TODO:

* Add handle
* Increase surface area of notches
* Make walls thiner