sentences:  MFC hosts heavyweight fights but doesn't have a heavyweight championship due to the lack of heavyweights outside of the top promotions.MFC employs the Unified Rules of Mixed Martial Arts.All MFC bouts take place in a ring, with the exception of MFC 29 which, in accordance with the regulations utilized in Ontario which requires all mixed martial arts fights to be held in a cage structure, took place in a circular cage named ""The Ring"" by the winner of a ""Name the Cage"" fan contest.