What are the seats directly attached to on the Cobra roller coaster at the Tivoli Friheden amusement park? 
Cobra (Tivoli Friheden): Cobra is a steel inverted roller coaster at the Tivoli Friheden amusement park in Denmark. Inverted roller coaster: An inverted roller coaster is a roller coaster in which the train runs under the track with the seats directly attached to the wheel carriage.
the wheel carriage