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.
Metatron's Cube Crystal Grid
They are made of birch wood and you can choose between approximately 10" in diameter and 1/4" thick.
If you purchase the one with crystals it includes adenturine, clear quartz, aquamarine, amethyst, citrine, rose quartz and the heart shaped amethyst cluster.