Ditto the others if you are meaning borium. Borium - Wikipedia, the free encyclopedia
One can also buy borium head nails which give a lot more traction and even footing for a trail horse than the usual three glumps of borium that are welded to the horse shoe.
I have owned Tennessee Walkers for 19 years and I am also curious as to how and why borium is associated specifically with them -- if that is the word you are meaning Borium is used on any horse
to help keep them from sliding on paved roads or to give them traction when going thru rocks. It has nothing to do with breed.
There are metal bands that are used on some Walking horses for certain classes they are shown in because these horses wear "stacks" or "pads" to enhance their natural gait. The metal bands keep those stacks on. They are legal.
Before the advent of boots, I have seen metal bands used on any breed of horse that is used on the trails and who had a tendency to throw shoes. Many times farriers would (and maybe still do) band shoes to keep the horse from throwing them.
Again, just curious what prompted the question and why it's associated with Tennessee Walkers?