Get chic on-the-go diffusion with Plant Therapy's Multi-Crystal Carfresh Diffuser. Make your commute much more bearable - it takes just 3-6 drops of your favorite essential oil or blend to fill your car with whichever scent you choose. With an acrylic crystal and stainless steel clip, the simple, easy-to-use magnetic lock,3 Crystal covers, and replaceable refill sticks make this diffuser your go-to for the car. Our Crystal Carfresh Diffuser is 3.6 inches x 0.5 inches and due to a flexible tension clip will fit on MOST sizes of car vents. Each foam refill stick lasts a variable amount of time, depending on your use of heat or cold and depending on which essential oils you choose to diffuse.