This is a Metatron's Cube crystal grid made out of Birch wood. Metatron's cube contains every shape that exists in the universe God has created, and those shapes are the building blocks of all physical matter.
They are known as Platonic solids because the philosopher Plato linked them to the spirit world of heaven and the physical elements on Earth. Those three-dimensional shapes appear throughout creation, in all everything from crystals to human DNA.
These are 6 inches in diameter and 1/4" thick. This is just for the grid, stones much be purchased separately.