These extra strength neodymium magnets, made from an iron-boron compound are deep penetrating. One half-inch diameter allows for placement in small areas, fingers, toes, etc.
The North Pole should face the user. The "N" has rubbed off making it hard to decipher. The magnet seems strong and it might be helpful; it is hard to know. I do like the product but wish the "N" did not rub off.