Yup, I’ve used these here. They are not indestructible. They are OK for cheap electric fence posts. But the little hooks that hold the tape will break. I don’t know why or how, but they do… because I’ve got broken ones. They are crappy, but cheap. And are functional for a while.
You understand that the “tape” only lasts SO long too, right? The little metal strands that run through the tape will part company in time, in working in the wind etc, and break, and the tape will no longer be “hot”. If you want the fence to both “work” AND be “seen”, run the tape AND a metal wire together through your supports. If someone gets tangled up in it (it happens) the wire (especially aluminum wire) will break before the tape will. That’s a GOOD thing, you want it to break. I’ve used tape, when there is no fence and I need it to be seen. But I run a wire with it as well, to make sure that it all carries a charge. Run the wire in the same holders as the tape. I find that once the horses know about the electric shock, you don’t need the tape any more. They see a wire just fine. And respect it.