Super Grade™ Alchemy Crystal Singing Bowlss^® are crafted with ethically sourced 100% pure quartz crystal and are renowned for their premium quality and powerful experience. With our unique and proprietary process, we ensure an increased density in the bowls, resulting in a deeper and more powerful resonant sound with unparalleled tuning accuracy and tonal quality. Super Grade™ Bowls also have a more clear pure crystal which makes them look extremely reflective and beautiful.