The Frequency Disc in Black Marble Hexagon (3.5") is a compact, powerful tool embedded with proprietary Human Blueprint™ Frequencies. Using ZeroPoint™ Technology, this disc is designed to promote energetic balance and homeostasis, helping the body's natural balance in the face of today's environmental stressors. Its unique design makes it perfect for both personal and household use, blending seamlessly with any setting while providing continuous vibrational support. The Fissure line is NOT defective. It is in natural stone.