This 25 foot black Plenum SVGA Cable has two HD15 male ends and features ferrite beads, coaxial construction, double shielding and a plenum rated jacket. Its primary use is for connecting a computer to a computer monitor for video display. The ferrite beads/cores are small iron oxide alloy cylinders wrapped around the ends of the cable. They are used to suppress EMI/RFI electronic noise on the cable by absorbing the unwanted high frequencies and dissipating them. The coaxial construction and double shielding work to further suppress noise, delivering you the best picture possible. The plenum rating means that the cable is jacketed in materials which have low toxicity smoke characteristics and fire retardant properties. Plenum jackets are required for installation in plenum spaces. Our SVGA video cables can handle the lowest resolutions used on computer monitors today all the way up to a maximum of 2048 x 1536.