These diffusers can be hung in your vehicle. But, you can also stash these little bundles of fragrance all over your home in closets, on bookshelves, in the bathroom, your boudoir... A pack of four includes Bibliophile, Mulberry, Beachwood and Istanbul fragrances.  2 oz each. Unscrew the cap and remove the stopper to begin enjoy these little treasures.  Take care how you hold the containers once the stoppers are removed, as spillage may occur.