Features: Applicable for M40X M50X M70X (Not suitable for M50X Bluetooth-compatible version);for HD518 HD558 HD595 HD598 etc. Adaopt environmentally friendly PU material spring wire, delicate feel, strong and durable, good sound quality; Wire diameter: the outer diameter of the main wire is about 3.8mm. Product plug: pure copper gold-plated 3.5mm plug, with 3.5mm to 6.3mm adapter; Cable only, headset is not included. Specifications: Material:PVC Color:Black Plug: 6.35mm/3.5mm-2.5mm Length:Approx.120cm/47.24in;140cm/55.12in ;300cm/118.11in;(Optional) Package Includes: 1x Headphone Cable note: Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.