Nor-class Cardassian space stations have six pylons, usually used to dock larger ships. Three radially-symmetrcal pylons curve above main docking ring at the center of the station and three extend beneath it. The docking pylons are manufactured from twenty-six percent kelindide. (DS9 reference: Star Trek: Deep Space Nine Technical Manual) Watchtower-class Federation space stations have six pylons wich extend radially from the "shaft" of the station.