stardrift 10-Pack 11mm Diameter Snap on Ferrite Core Bead Choke Ring Cord RFI EMI Noise Suppressor Filter for HDMI DVI VGA Cable Black RFI EMI Filter:Stop EMI and RFI effectively to improve signal integrity Application Occasion:Clip them on HDMI Cable, IP Line of Communication, DVI Cable, Overstriking VGA Cable Clip On Ferrite Cores:The core has small clips on it,it can be opened and clipped on to a cable easily Well Made and Nice Quality:Made of Plastic Housing and Ferrite Core,can work for a super long time Suitable for 11mm cables;Package Includes:10 * 11mm Ferrite Core Ring