Ferrite Core Noise Suppressor Filter Ring Materials: Ferrite core material designed for durable, longlasting use. Effective noise suppression: Designed to cancel out noise on USB, Firewire, Phone, Powerline, Coaxial, Audio, and Video cables, providing a clearer signal. Wide compatibility: Suitable for use with computers, hard disks, audio equipment, copiers, fax machines, and more. Easy to install: Clipon filter ring attaches to cables with a diameter of 5 mm for immediate noise cancellation. Size and fit: Compatible with 5 mm diameter cables; simple clipon design requires no tools. Use scenarios: Desktop computer setups with USB devices or external hard drives seeking reduced interference. Audio and video systems using coaxial, audio, or video cables for clearer signal. Office equipment such as copiers and fax machines to minimize noise and improve reliability.