Each crystal is a clear crystal from Brazil in a Vogel Cut to its frequency. Marcel Vogel (1917 - 1991) was a research scientist for IBM. The Vogel-cut® crystal is an instrument that serves to store, amplify, convert, and cohere subtle energies....again, amplifying the energy:). Moreover, they are color-coded to your Chakras. Process: You lie on the Biomat (low-setting), and we place a white sheet on you and a white cloth over your eyes. White assists in you absorbing energy. Key: Have an intention before the process begins and then enjoy the experience.