Rare Earth Magnet with North and South Pole. 2 inch diameter 1/4 inch thickness. Comes with a thick pouch cover. The magnet should be kept inside the pouch at all times and is the Perfect size for muscle testing.
Precautions: Do not use near medical devices such as pacemakers or other magnetically programmable or magnetically influenced medical devices. Use caution when handling magnets as they have a strong pull force.