I got mine from 3fvape. It cane with orings and just a plain little white box. So the fasttech one just like the authentic? Mine came clean no oil, or smell, and no burrs at all everything was well machined. I work at a machine shop. I can tell this is well machined and believe that the same company that makes it for footoon made these. I see a flaw on mine where a tool broke, so these could be very well the same as the v2 from fasttech if you guys remember. Overall its amaxzing better than the v2 and better flavor. I have no way of knowing what ss is used. Also notice at the bottom of page of the 3fvape says "If you find a product to be authentic, then it is not a clone. Aqua SE Style RTA Rebuildable Tank Atomizer - Silver, 316 Stainless Steel, 2.5mL, 22mm Diameter, review, price, shipping"