Sensitive: Electronic devices produce certain frequencies that may disturb other electronics that are sensitive to those frequencies. It doesn't matter if it's a household appliance or in an automotive application: Ferrite rings are a common way to curb these disturbances.Hows it work? A ferrite core or bead can be added to an inductor to improve, in two ways, its ability to block unwanted high-frequency noise. First, the ferrite concentrates the magnetic field, increases inductance and therefore reactance, which impedes or filters the noise.Designed: To be used on the output cord of any HID ballast or input wiring on an HID bulb, no matter OEM or aftermarket parts; If your radio is picking up static from your new HID system, these will help.Read on: Want to know more about how Ferrite Rings work and why they're needed on many modern electronics? Check out this Informative Article.Confidence: Order with confidence when purchasing through our website. The products offered have been thoroughly tested to make sure they meet our strict quality standards to ensure the best reliability and performance. We always provide honest feedback on products and helpful tips for any project due to our extensive experience with all makes and models. We offer competitive pricing, fast shipping, and the latest and greatest products from the top manufacturers. Contact us today with any questions; you won't regret it!WHAT'S INCLUDED2x Rings: Ferrite ClampsWarranty: 5 years