It is 3/4" box tube that makes up a 5" truss making it quite strong an still light enough I won't mess up the wood floor. The adjustable padded feet also help out. Couldn't fit all of the most used equipment on at one time so there is a bottom shelf to hold them and an air compressor a friend gave me. It came out of a dentist office so it puts out quite a bit of air and is super quite. Still needs finish work and paint but you can get the concept.