Features: The sound is amazing, clear, strong and deep, and rich vibration-resonate with the power to heal. When you playing the crystal singing pyramid, you are not just performing a sound therapy, but also a crystal healing that is extremely penetrating. A nice gift for friends and families. The sound produced resonates with nature\'s own frequencies and affects the frequencies at which nearby objects form molecules. After careful grinding, the surface is smooth, the joint is firm, safe to use.