On "Seinfeld", what material is the Festivus pole made of?

On "Seinfeld," the Festivus pole is made of aluminum. Frank Costanza chooses the plain metal pole because he finds traditional Christmas decorations too commercial and distracting.

The pole appears in "The Strike," the season-nine episode that popularized Festivus. Frank keeps it in the apartment and explains that he finds tinsel too distracting, so the holiday uses a single undecorated aluminum pole instead. Its stark appearance fits Festivus's deliberately anti-commercial spirit: no ornaments, lights, or elaborate tree are required.

The pole is only one part of the fictional holiday's ritual. Festivus also includes a dinner, the airing of grievances, and feats of strength. During the airing of grievances, participants announce their complaints; the feats of strength traditionally conclude the celebration when the head of the household wrestles someone into submission.

The real-life tradition that inspired the episode did not necessarily use the same standardized pole. Dan O'Keefe adapted his family's unusual custom for the show, where the aluminum pole became its most recognizable visual symbol. It is therefore specifically the Seinfeld version that canonically calls for aluminum.