The lava rock acts as a natural diffuser and absorbs the oils giving you aromatherapy wherever you are. You can use multiple different oils the same day as one application lasts around 4 hours. All bracelets are stretch and have hematite spacers and quartz or howlite surrounding the lava. Soladite aids communication and psychic abilities. It can stimulate latent creative abilities and is great for writers, public speakers, artists, etc. It helps you live up to your own truth.