They are just aluminum stock I machined. Nothing special, but I made them myself so they match. The bottom shelf is my custom Switch/DAC
It has a pupdac and a RCA as inputs controlled by right switch, and 6 outputs controlled by the knob.
The shelving was a quick and dirty job, at this point I am just trying to get through grad school and get a job, the next desk I will build from the ground up correctly, rather than just bolting junk onto my old stuff.