6 Pcs Black 15mm Dia Cord Ferrite Core Noise Suppressor Filters
Helps reduce EMI on AC power lines. Black plastic enclosed ferrite core for 15mm 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.