Honest Lava Rock DiffuserThe porous nature of lava rocks is perfect for absorbing essential oils. Honest Oil lava stones are naturally sourced from volcanic mountains around the globe. They are incredibly porous, meaning there are lots of air pockets for oil. Lava diffusers work by allowing the oil to evaporate slowly. Uses Great for diffusing in your car. Our unique design fits in most cup holders. Take it on vacation or have it in your office on your desk at work. Allows