Quartzophone DuoThis listing comes with the Quartzophone Duo, mallet, pamphlet, and a box. These instruments come with a 1 year manufacturer guarantee. Note: The instrument in the video is not the exact item you'll receive, but a very good example of the look and sound, using a Quartzophone Duo from our inventory. The Quartzophone Duo features two perfectly matched, pure Quartz tubes. They are mounted to an acrylic base with two continuous, zigzagging strings and