Product Name: Ferrite Core Filter; Type: Ferrite Core Noise Suppressor Outer Size(Approx): 2.8x1.5cm/1.1inchx0.6inch(L*D); Suitable cable diameter: 5mm/0.197" Material: plastic (body), ferrite (core); Color: Black Net weight: 50g Helps reduce electromagnetic interference in AC power lines. Ferrite core in a black plastic case for 5mm AC power cords. Great for interference suppression in USB, Firewire, phone, power cord, coaxial, audio, video, etc. Simple structure and easy installation. Just clip it and you will get more clearer signal and faster data transmission. package content: 6 ferrite core filters Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The allowable measurement error is +/- 1-3 cm.