Reduce electromagnetic interference and improve signal quality with this 5pack of RFI antiinterference magnetic rings. Designed for easy installation and longterm use, these ferrite cores help protect audio, video and data signals and reduce noise on power lines and cables. Key benefits Cuts RFI/EMI on data and power cables to improve signal integrity and audio/video clarity. Snapon design with spring plate for tool installation and a secure fit. Durable, heat and wearresistant black finish for reliable performance in daily and industrial use. Pack of 5 provides multiple points of protection for home, travel, or equipment racks. Features and specifications Material: Nickel zinc ferrite with enhanced magnetic permeability for effective noise suppression. Design: Doublebayonet shielded construction to increase filtering efficiency and stabilize signals, even when cables are moved or during travel. Sizes: Fits wires up to 13 mm diameter; common internal diameters included for 3.5 mm, 5 mm, 7 mm, 9 mm and 13 mm cables. Installation: Snapon ferrite cores with spring plate clamp securely without tools; easily opened and closed for reuse. Finish: Black, wearresistant and heatresistant surface suitable for prolonged industrial or consumer use. Quantity: 5 magnetic rings per . Compatibility and performance Works on a wide range of cable types including power cords, USB, HDMI, network (Ethernet), audio cables and other data lines. Effective in both low and frequency interference scenarios thanks to nickel zinc ferrite material and shielded geometry. Practical use scenarios Travel: Snap on to laptop power adapters, phone chargers and USB cables to reduce radiofrequency noise and maintain stable connections on the move. Home AV: Install on HDMI, coax and audio interconnects to reduce hum, hiss or signal dropouts in home theatre and streaming setups. Industrial/Office equipment: Fit to power and data lines in equipment racks, measurement instruments or lab gear to minimize interference and improve measurement consistency. Quick tips Choose the core size that most closely matches the cable diameter for a snug fit. For heavy interference, use multiple rings at different points along the cable (near connectors and at power entry points). Reusable and easy to reposition as cables or equipment change. Includes five snapon nickel zinc ferrite magnetic rings with springplate closures and a durable black finish.