I have two sets of tubes I had custom made for me for a square circle I built. There are two sets because I planned to build two SC's; however, ended up not building a second one. I'd be willing to part with a set of tubes if anyone wants a very high-quality set! The outer tube measures 7" x 12". The inner tube measures 6-3/8" x 11-3/4" and has a solid bottom if you wanted to assemble the illusion piece by piece then go through the regular routine.

I'll part with a set for $75.00 (plus shipping)

I can send pictures if you are a serious buyer

-Bryan