This is a brand new, all steel retro air cleaner. The air filter is included. This air cleaner is based on the style and dimensions of the '51-'56 Oldsmobile or Cadillac air cleaners. This will clear most HEI distributors. It is constructed from very heavy duty steel. The finish on them is not flawless, there are some small imperfections on the surface. However, it is still a great value on a heavy duty hard to find piece. This is a great addition to your traditionally styled street rod or hot rod. It fits most standard 5 1/8" 4 barrel carbs.