This is an enormously powerful disc to use while meditating. I would place it right in the middle of my forehead while meditating. You can also place it underneath your pillow when you go to sleep at night. This is a great disc for anyone who meditates, who is wanting to connect their soul, mind, heart, and spirit, and those who are wanting to feel more grounded.
Size: 3 inch diameter.
Very happy with my purchase.