This is an Ammonite crystal grid made out of Birch wood. These are approximately 6” in diameter and 1/4" thick. This is just for the grid, stones much be purchased separately. The Ammonite is a very powerful earth healing fossil. Its spiral shape symbolizes continual change and evolution. Ammonites have absorbed cosmic energy over eons of time and help to stimulate the life force (Chi) within. Ammonites are often used for activating Kundalini and life path energies. The Ammonite is also often recommended to put in the home to attract health, prosperity and success. Crystal grid and healing sets are groups of stones that go together for a purpose. Sets of crystals and stones are used for ritual magickal or spiritual crystal healing purposes or with Reiki-Seichim energy work for healing. Some are generalized and others have specific purposes.