The Pipe Shoppe - Red Yellow Zigzag

The Pipe Shoppe's Red Yellow Zigzag is a fun and funky single whistle that sounds great too. 

Made of biodegradable plastic. 

Sound examples here: soundcloud.com/user-68797887-355661884/wobbly-finger

Avoid temperatures above 50°C as it might deform (hot cars or windowsill).