These ceramic Oil Diffusers are designed to clip onto your car's air vent and allow your favourite essential oil to add to the atmosphere of your car. A lovely natural alternative to chemical air fresheners. Just add a few drops of your favourite oil every week or so. They are available in a range of designs - when ordering please quote the design and colour your wish to purchase.  Special designs are available to order - favourite football team or company logo? - email me for a quote and minimum orders.