Our Heart Car Diffusers offer a natural way to freshen your car and transform it into a traveling oasis. The vent clip slides easily onto a traditional vent letting the diffuser hang naturally providing a colorful car charm that also diffuses. Simply add a drop or two of your favorite essential oil to the white clay tile, and let the natural scents diffuse gently into your car's interior. More about the diffusers... - slides onto car vent for easy installation - can switch between oils once the bisque fired clay tile has released the aroma - felted balls are fair trade from 100% wool which can also take on oil - instruction and care sheet is included *packaged in clear bag to keep clean and contained * Diffuser Size... 3 inches long x .75 inch wide