Just took a look at the invoice and...
It's made of 1/4 in. clear "custom acrylic audio jewelry."
The inside dimensions are w 19 7/8 x d 17 x h 8
There are finger cut outs on the sides, and there is a centered 16 x 4 cut out for cables in the back.
Thanks for prodding me to do that, Roscoe...
