The Blue D Mag is without a doubt, the strongest cattle magnet on the market. No other magnet has SIX magnetized surfaces. Perform your own trial against any other magnet. More metals adhere to this magnet than any other and all metals slide on the smooth nylon coating....no rings and no ridges to catch metals.
Safer than other magnets for livestock because the smooth nylon reduces perforations. Food-Contact grade. The high safety rating is a plus over all other magnets. It's top of the line strength for the money. FDA approved and made in the USA.
When in the cow's stomach, metals on the magnet can be repositioned with minimum pressure on the reticular wall, reducing punctures.
Cattle eat quickly, without sorting their feed. They often ingest foreign material, especially when eating hay or processed feed. The magnets are designed to sit in the cow’s rumen.
Foreign objects that don't pass through usually fall into the reticulum. Contractions of this stomach during normal digestion may push them through the stomach wall. The reticulum lies against the diaphragm.
Cows may ingest fence staples, barn nails, bits of wire or any other objects that find their way into the feed. Old fence wire lying in a field, with the hay grown up around it, may be chopped up by the swather and baler, ending up in hay. Nails, roofing tacks or other sharp metal objects are often found around a barnyard or a junk pile that cattle have access to when grazing. In feedlots, metal pieces may come off feed-handling equipment and be mixed with the feed.
And it sits there collecting stray metal before it can cause the cow pain. The magnet remains inside the cow for the life of the animal (and apparently can be reused afterward), and the presence of the magnet and the attracted metal in the rumen apparently has no effect on the cow’s health or lifespan.