. The Advanced Rhythm Chamber
This World Percussion instrument - measures about 17.5" long and 7.5" top and 10" at the bottom. Thickness varies from about 1.5" to about 4".
The standard rhythm chamber comes with the two jingles attached and the padded case
The package includes the rhythm chamber, and a padded case with shoulder strap.
I think your designs were ahead of their time, Ken.