Galvanized then black powder coated steel tube.
As posts: These cost about the same and replace the traditional angle steel posts used in gardens. Unlike angle steel posts, these round posts have strength in a complete circle (suitable for side to side strength and also back and forth pressure from animals). They also have a nice gloss black powder coat finish and are nearly invisible from a distance. Attach fencing to these posts with fence ties. 93 1/2 inches long