22piece ferrite core bead choke ring set 22 noise suppressor rings in various inner diameters (5 mm, 5 mm, 7 mm, 9 mm), ideal for a wide range of cables including USB, audio, and power cords. Antiinterference design Nickel zinc ferrite material clamps onto cables to reduce electromagnetic interference and enhance signal stability, delivering smooth performance for your devices. Wide application Suitable for car DVRs, headsets, speakers, keyboards, and more. These choke rings are for any electronic wiring harness or appliance needing noise suppression. Easy installation Simply snap these rings onto your cables to improve current stability and sound quality without the need for tools or expertise. Use scenarios Vehicle electronics: enhance the reliability of dash cams, car stereos, GPS, and power cables by reducing EMI on data and power lines. Computing and peripherals: improve USB cables, headsets, keyboards, and speakers for clearer signals and reduced noise. Home theater and audio systems: clean up audio cables and speaker wires to achieve better sound quality with less interference.