Tetra Rods Steel, not PVC?

[Goobergunch]

From Section 3.3 of the manual:

Each edge of the Tetra is defined by a 30-inch length of 1-1/4” Schedule 40
(approximately 1.6” OD) PVC pipe. The ends of the pipes are attached to
“Tetra Connector” to form each apex of the Tetra. The Tetra Connector is
a custom injection molded part. When properly constructed, a Tetra stands
approximately 28 inches tall and weighs approximately 8-1/2 pounds.

So they're PVC.