for WHCH520 Headphones : Specifically designed replacement headband hinge brackets for WHCH520 headphones, ensuring precise compatibility and securely fit to loosening issues during use. Durability Construction : Made from that excellent wear resistance and shock protections while being lightweight and rustproof, ideal for commuters and travelers. Balanced L+R Symmetrical Design : Features left and right symmetrical structure to maintain even weight distribution and enhances wearing comfort, eliminating imbalance from single side replacement. Professional Installation Required : Requires disassembly and soldering skills for proper installation please verify your technical capability before purchasing these replacement parts. Build :Manufactured using recyclable materials to reduce environmental shock, making it for consumers.