15000 Gauss SUPER POWERFUL Pair of magnets WITH MAGNETIC INDUCTOR (AS PICTURED) for medical biomagnetism in THIS RARE PRESENTATION, vinyl covered, polarity is shown by color (red is + black is -), these heavy and large magnets have only one polarity, they can be used for specific and important situations (kidneys, back, legs,etc) if you need more, please contact me. Please see all pics for more information and dimensions. Polarity: BLACK IS NEGATIVE AND RED IS POSITIVE.