This is a double Square crystal grid made out of Birch wood. These are made to order, you can choose between approximately 4, 6, 8, 10, 12, 14, 16 and 18 in diameter and 1/4" thick. This is just for the grid, stones much be purchased separately.
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.