looking for giant metal hoops/tubes?

[Creatomatic]

I am constructing a working sculpture of an atom. I need to find 3 hollow metal tubes fashioned into hoops 7' in diameter, 2-4" thick. They will each house a ball-chain inside moved freely with an electric motor. Where do I find these pieces? I would appreciate if anybody had any ideas where to look. I live in NYC : creatomatic@yahoo.com. Thanks.

 

[butelja]

For having custom piping bends made, I have had good luck with Tulsa Tube Bending in Tulsa, OK or Bendco in Houston Texas. Naturally, with any of these vendors, your pricing per bend will be more reasonable if the quantity of the order is larger.