Application: on head/forehead, neck, upper back, shoulder, lower back, elbow, wrist, hand, thigh, knee, calves, feet. 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. laboratory gauss rating 10,000 + adhesive strips included Two in a pack! Marked with Bio-North Pole. see also our MagneLyfe Gold Neodymiums.