This 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. | Agri-Pro Enterprises Blue-D Mag Cattle Magnets 3 Pack