These bracelets are hand-made on Maui using beads made from natural volcanic basalt combined with colored beads. The sodalite bracelet—also known to some as "Yooperlite"—contains spots in the beads that glow under black light in a dark space. They are perfect to use with essential oils. Due to their sponge-like composition, the beads soak up the oil and retain it in the core of the bead. Simply add a drop or two to the lava beads and your diffuser bracelet will carry your favorite scent. Lava is known to be a grounding stone that has connections to the earth. They are strung on an elastic cord and one size fits most. 8-8.5 mm beads. Packaged in a gauze drawstring pouch for giving.