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* Package included: 8 pcs(with 4 different size icluded)* Fits for cord with 5/7/9/13mm inner diameter;* Easy to install with double snap clips * Reduce electro-magnetic interference and improve signal integrity * This rectangle Ferrite Bead can be widely used in a variety of Data cables, USB cable, telephone line, Network Line to Shield external electromagnetic interference.* In order to ensure the safety, reliability and purity of data transmission. * Helps reduce EMI on AC power lines. Black plastic enclosed ferrite core for 5/7/9/13mm AC power cords. Great for cutting noise on USB, Firewire, Phone, Power Cord, Coaxial, Audio, Video etc cables. * Easy Structure and convenient installtion. Just clip it on and you will get clearer signal and faster data transmission.