You asked, and we delivered. These are 10mm porous lava rock beads perfect for use with essential oils. Gently dab on a little bit of your favorite essential oil for a subtle dose of aromatherapy.These natural black lava beads have been lightly treated with oil to give them a smoother feel to the touch. Match these natural beauties with some wood beads for a more ethnic look. We think you will really enjoy designing with these natural lava rock beads.