3 Level Shielding-Braided Pure Copper Layer+Aluminum Foil Covering Layer+Ferrite Ring, Better Limiting Rfi And Emi Interference. ^^ Compatible Devices-Perfectly Matched To Power Filters, Turntables, Amplifiers, Cd Players, Dacs And Other Electronic Devices To Enjoy Perfect Music Anywhere, Anytime. ^^ Powerful Inner Core- Multi-Stranded 99.99 % Oxygen Free Copper Is Used As Conductor Material+High Quality Gold Plated Pins & Contacts For The Best Conductivity And Transfer.