Enamel Car Vent Diffuser Set Wild Essentials car vent aromatherapy diffusers are made with a hypoallergenic, surgical grade 316L stainless steel pendant and includes 8 vibrantly colored, premium refill pads. Aromatherapy On the Go: Great for any vehicle, our essential oil car vent diffusers allows you diffuse your favorite scents using your vehicle's HVAC system! Fashion-Forward and Functional: Stylish and versatile, our car vent diffusers have a secure magnetic closure and have vents in front and back of the locket to ensure proper air flow to let your scents fill the air. World-Class Craftsmanship: Made from hypoallergenic, surgical grade 316L stainless steel, our diffuser is as sleek as it is durable!