Amazon.com: Syncwire 3.5mm Nylon Braided Aux Cable (3.3ft/1m,Hi-Fi Sound), Audio Auxiliary Input Adapter Male to Male AUX Cord for Headphones, Car, Home Stereos, Speaker, iPhone, iPad, iPod, Echo & More – Black :
Amazon.com: Youkamoo 2.5mm Balanced Headphone Replacement Cable Compatible for Hifiman HE4XX, HE-400i Headphones 8 Core Braided Silver Plated Headphone Upgrade Cable (Dual 3.5mm Male Version) 4 ft (1.22 m) : Electronics