Core material: Bare copper wire

Wire material: oxygen free copper

Replacement Audio upgrade HIFI Cable with Dual 2.5mm to 3.5mm & 6.35mm
Note: please confirm your headphone is the one with dual 2.5mm male ports. this cable has dual 2.5mm male that be putted into headphone ports, it only fit the Hifiman headphone with dual 2.5mm plug, it doesn't fit the latest version of HE400i that with dual 3.5mm male plug or doesn't fit the latest version of HE560 with dual 3.5mm male plug. if you are using HE400i with dual 3.5mm male plug or HE560 with dual 3.5mm male plug , please choose the other one with Dual 3.5mm male to order.
length: 1.8 M, spring extension about 5 M. The package includes: 1 * Replacement Cable (excluding earphones) with cable diameter of 3.8 mm (3mm after fork) and cable material made of internal OFC wire.
Jack:Dual 2.5mm to 3.5mm & 6.3mm Adapter
it is compatible with Hifiman HE400S / HE-400I ( old version with dual 2.5mm male plug)/ HE560 (with dual 2.5mm male plug) / HE-350 / HE1000 / HE1000 V2 / AudioQuest NightHawk headphones

Suitable for: Compatible with Hifiman HE400S/HE-400I (old version with dual 2.5mm male plugs)/HE560 (with dual 2.5mm male plugs)/HE-350/HE1000/HE1000 V2. HE400i. Please distinguish between the latest and old versions, with the latest version having dual 3.5mm plugs and the old version having dual 2.5mm plugs.