Amazon.co.jp: wumio Ferrite Core, Noise Filter, Inner Diameter 0.2 inch (5 mm), Set of 10, High Frequency Noise Reduction, Cable for TV, Monitor, PC, Drive Reco, LAN Cable, Noise Protection : Computers
Amazon.com: Clip-on Noise Filter,VSKEY[10pcs 5mm] Anti-interference High-Frequency Ferrite Core Choke Cable Clip for Home Audio System,Tvs,Speakers,Radio,Audio Equipment Noise Suppressor (0.2 inch inner diameter) : Electronics
2pcs Black 5mm Clip-on Noise Ferrite Core Ring Bead Filter RFI EMI Cable .j6 | eBay
▷ FREE 1 ferrite core against electrosmog in headset | grey