So dissapointed in this ... the only good about this is casing made from metal.Pro: Casing is metalCon: 1) Casing doesn't have a thing where you could adjust how strong or light scent coming out of the Casing, which makes you be hit with overpowering scent, especially in an enclosed space like a vehicle.2) The sharp ocean breeze scent is such a strong scent, and not suitable to be used in an open Casing with no adjustments. I had to put the stone under the seating in a medium thick fabric bag, so the scent isn't too unpleasant.3) When I was looking for refills on other scents, I realized the refills isn't a type of liquid where you would drip onto the stone, to be able to reused the stone continuously; but, they are trying to sell more stone scented refills. To me this is very unenvironmentally friendly.4) If I knew ahead of time on how awfully though out product is, and the aftermath it may do to landfills and environment, I would of never of got this expensive item.I guess I'll have to keep this, and find another way to refill this, by purchasing a liquid fragrant for refilling and reusing the stone.