I bought these for my arthritic horse a couple of years ago. Orignally they had one long magnet per boot and this has now changed to two small ones per boot. After losing one of the long magnets after I took them out to wash the boots, I bought a set of the smaller magnets. The magnets are quite soft and pliable and didn't rub my horse at all. The boots are well shaped and fitted nicely around the fetlock and pastern.
The only downside I had with the boots was that the magnets cracked and split resulting in them now being held together with tape.
(Written by: trojan_warrior)