Noise filter Ferrite - Noise reduction There are many sizes - homenet48
Amazon.co.jp: KAUMO Ferrite Cores φ5mm 10 Pack High Temperature Corrosion Resistant Abrasion Resistant Noise Filter Noise Absorbing : Office Products
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
▷ FREE 1 ferrite core against electrosmog in headset | grey