Say goodbye to boring and ugly cardboard trees hanging from your rearview mirror! These essential oil diffusers gently clamp onto your car vent! Add your favorite oil to the glass jar bottom, add the clamp, and gently screw on the lid. Pop the wooden reed diffusers through the holes in the cap to absorb and slowly release the essential oil into the air! Voila!! A car vent diffuser is the perfect way to enjoy your favorite essential oils on the go! (Oil not included)