This is a classic wah-wah tube, called a Zen tube. It is a tube of anodized aluminum metal that is highly resonant. You can strike this tube to make rhythmical beats, and as well, put your finger over a little hole on the tube to distort the sound into a "wah-wah" effect. These tubes come in a Gold, Blue or Black edition, each with a separate tuning. Together they made a "Do-Re-Mi" incremental progression. Each comes with a striker. Please review the sound files below:
Blue - 11"
Gold - 10"Black - 9.75"