Sennheiser 3.5 mm M to 6.3 mm F 6.3 mm 3.5 mm Gold, Black Cable Interface/Gender Adapter – CABLE INTERFACE/Gender Adapter (6.3 mm, 3.5 mm, 0.23 m, gold, black)

Sennheiser Genuine Adapter Cable Female 1/4" 6.3mm to Male 1/8" 3.5mm Plug for Headphones

ANDTOBO 1/4'' to 3.5 mm Stereo Pure Copper Headphone Adapter, 3.5 mm(1/8'') Plug Male to 6.35 mm (1/4'') Jack Female Stereo Adapter for Headphone, Amp Adapter, Black 2-Pack

Sennheiser HD 800 S Over-the-Ear Audiophile Reference Headphones - Ring Radiator Drivers With Open-Back Earcups, Includes Balanced Cable, 2-Year Warranty (Black)