Glass represents the energies of transformation, uniting of elements, rebirth, focus and communication. The colors of the glass carry the vibrations of those specific color energies. About Lava Rocks: Basalt and related rock types like andesite and dacite are rocks that form when volcanoes erupt magma (lava) onto the surface of the earth and the magma cools. Lava beads are porous and can absorb the oil of your choice. Directions: I suggest applying just a drop or two of essential oil to the beads. The scent will last a day if not more. You can use any of your favorite essential oils. The rocks are mounted on a sturdy plastic stretch cord. Materials: Lava Stone, Glass Beads, Pyrite Beads: 6mm Length: ADJUSTABLE