Crystals have long been known for their curative power. They are used in preparing tinctures. They are worn as amulets for their protective characteristics. They enhance the energy fields of the body as they emit uniform vibrations. Such are the beliefs of the people in this database. They are regular customers of specialty shops that sell various kinds of crystals as well as literature on the subject of crystal healing. They volunteer their names to be in the mailing list so that they can receive information on new items that are available from specialty shops. These people respond well to offers covering newsletters on related topics like longevity, sports, and alternative medicine. They have been targeted by distributors of sports equipment, and the results were fairly satisfactory.