my aunt built one, about 8 (maybe more or less) feet tall, with normal wooden fence boards. But the board had no spaces between them, so no bailing! But it's super sturdy, they don't usually work with stallions(only young colts) and my aunt has no patience for crazy animals, if one tryed to hurt her it would be off that property faster then you can blink.
I have also seen metal ones that were kinds temperary, they were pretty darn solid, I've watched horses slam themselves up against then without them moving an inch, but it's really easy to picture a horse getting caught on it.
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