It started as a joke and a riff on the commercialism of Christmas. But Festivus — “the festival for the rest of us” featured in a 1997 episode of “Seinfeld” — is catching on as a real holiday.

Wagner, a Milwaukee-based manufacturer of hand rails, has been making Festivus poles — a rod of shiny aluminum in either a six-foot floor model or three-foot table model — since 2005; The Associated Press reports that Wagner expects to sell about 600 poles this season, at $38 and $30 apiece, respectively.

It also hopes fans remember that Festivus is a George Costanza holiday, not a Kramer creation. Wagner doesn’t want Michael Richards’ antics to sully the Festivus festivities.