These Percussion Plus PP3030 whistling tubes, or ‘noise-makers’, are not only incredibly fun to play, but also demonstrate the fascinating physics behind music. Play the instrument simply by twirling the red tube around in the air. When air moves through the tube, it produces a range of tones, loosely on the harmonic scale. This is caused by the air molecules within the tube bumping together, vibrating and producing sound waves. The faster you twirl it, the higher the tone that is produced. 

 FEATURES

• Simply twirl in mid air for unusual whistling sound
• The faster you twirl, the higher the pitch
• Made from 106cm length of strong red plastic tubing
• Great as a group or classroom activity