6.35mm TRS Stereo Male Plug to 3.5mm TRS Stereo Female Jack Audio Adapter About this item Headphone adapter set: 6.35 mm  audio stereo plug to 3.5 mm  stereo headphone jack adapter, come  with black color . earphone adapter can be applied to mixers and music applications, fit for use with guitar amps, stereo system, headphones, etc. Durable and transfer good signal.