Magnetic products have been used for years to relieve the effects of arthritis. There are two main theories on how static magnetic therapy work. The first is on the blood supply. There are many charged ions in your blood, that are either attracted or repelled by magnetic fields. This action is thought to widen blood vessels in the area covered by the magnets, which in turn, draws oxygenated blood into the pain affect area. The other theory is that the magnetic field inhibits the pain-sensitive nerves. As is common knowledge, when you perceive less pain, you relax more and are less likely to suffer from secondary muscle cramps and tensions. Magnetic products for horses include Bell boots, horse rugs, pastern / fetlock boots and shin /tendon boots.