1/8" stereo male to 1/4" stereo female adapter, allows the use of standard headphones with portable equipment.  

Specifications:

Outside Diameter: 0.127"

Dielectric Type: PFA, Cotton

Cable AWG: 20.5

Shield Type: Single

Conductor Type: 3 Conductor, Golden Ratio, Constant Q, Crossfield, Pure Copper Litz. Cardas Quality

Female 1/4" connector on one end and a Male 1/8" mini-plug on the other end