Decah and all other companies just use steel. It's cheaper then Ti or Stainless and it wont become weak like aluminum. They say its a special alloy but that's a load of crap. It's just steel.

Steel like you can buy at home depot but a little thicker and milled to look pretty. Then they paint it with "special coating" which is also a load of crap and just some kind of primer, rustolem kind of rust preventing paint.