Bayou Classic states that all of their stainless kettles are 304 stainless. 304 stainless is an Austinitic microstructure and is not generally magnetic. However, during deep drawing and grinding operations this alloy can undergo a microstructural change to a Martinsitic lattice, similar to some 400 series stainless steels. This probably accounts for the magnetic properties of the Bayou Classic kettles. Before buying however you might want to check the kettle with a magnet if you are planning on using an induction cooktop. You can always use an induction disk if you have non-compatible cookware. My favorite kettle is the Megapot 1.2 from Northern Brewer which has an aluminum clad bottom which results in improved distribution of heat across the bottom of the kettle. This pot uses 400 series stainless steel which has good magnetic permeability characteristics. This also has the 1.2 ratio of height to diameter similar to the Blichmann which gives you improved efficiency for brewing. Many of the Bayou classic pots also have this 1.2 ratio. Great article by the way in the March/April edition of BYO magazine about induction brewing.