ASEN 3.5mm 1/8" Sennheiser HD25/580/600/650 Headphone Replacement Upgrade Cable [1.3M] ASEN's exclusive 5N-OFC oxygen free smooth and pure copper conductor Ultra-thin multi-core, high density isolation structure designed to amplify stereo channel resolution, enclosed in a separation balanced design Soft and Flexible Cable Jacket, environmentally friendly with halogen free non-toxic materials Compatible with all 3.5mm to Sennheiser headphones, such as Astell & Kern Digital Audio Players and Sennheiser HD25, HD580, HD600, HD650 Gold plated plugs and connectors, with optimized soldering technology