This knee wrap aids in the breakup of calcifications. It helps to draw out fluid and promote healing. Standard Size. Classic Equine recommends using MagNTX products for a minimum of 30 minutes and no longer than 12 hours at one time. Ideal treatment periods will vary on a case by case basis. Ensure that the horse is adequately cooled down after a workout before applying magnets. Do not use any oil-based or abrasive liniments under MagNTX products, as these substances can cause damage. MagNTX magnets can be used in conjunction with preventative and treatment regimens. ALWAYS consult your veterinarian when using magnet regimens.