Make of zincs ferrite, which enhances the electromagnetic field around the coil and effectively resists external interferences Easy Installation: Features a cylindrical snapping on design for simple installation Just opens it, clip onto the cable, and it ' s ready to use Designed to reduce noise, ensuring a cleaner signals for your USB cables Widely suitable for electromagnetic interferences suppression in various electronic devices, such as data cables, USB cables, telephone lines, and net cables, to block against external electromagnetic interferences Size Variety 3.5mm to 13mm: Available in 7 sizes ( 3.5 / 4 / 5 / 7 / 9 / 10 / 13mm), these ferrite beads cater to a wide ranges of cable diameters for versatile use, Manufacturer: Obotsnoi