Lava Stone Chakra Healing Balance Stretch Yoga Bracelet Directions: Apply just a drop or two of essential oil to the black lava 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. Color : Black Lava Stone with gold accents and colorful stones Material : Lava Stone with synthetic amber Beads diameter: 8mm Made in China