5" in diameter with the sacred geometry of the flower of life imprinted upon the glass. Crystal grids are used to create potent patterns that you lay crystals upon and it creates a circuit per say and amplifies and works the energies of different crystals all in junction with each other in a particular formation or pattern. Using the sacred geometry of the flower of life is a really potent design because this geometry outlines the fabric of space and all of creation. So as you lay crystals in certain patterns using this geometry as the outline or framework, it creates a powerful resonance and works the energies that are in alignment and flow with the rest of the cosmos.