I'm guessing you mean the support structure for the desk and shelves, which seems to be a nicer version of something like https://www.uline.com/Product/Detail/

I'm guessing you mean the support structure for the desk and shelves, which seems to be a nicer version of something like https://www.uline.com/Product/Detail/H-4814/Wide-Span-Storage-Racks/Two-Shelf-Wide-Span-Storage-Rack-Particle-Board-60-x-24-x-36?pricode=WA9689&gadtype=pla&id=H-4814&gad_source=1&gad_campaignid=10688098226 https://www.uline.com/Product/Detail/H-4814/Wide-Span-Storag... or perhaps the same thing ( in several sizes ) with a coat of gloss paint