What I bought is 1″ OD x .065″ Wall 304 Stainless Steel Tubing.You can also get the .049″ wall which is what I think Ryan recommends due to price. What you want is drawn and welded tube. Which most tube this size is. Like Jeff says if it is like $400 then that’s not what you want. Depending on where you go for material they may also carry Seamless Tubing. Which is nice, but it is much more expensive. And for the MPCNC it is not really needed cause we are not dealing with burst pressures or corrosion. The tube for my 2′ x 3′ machine cost me about $150 cut to length and after sales tax.