Re-engineered 1/4 to 3.5mm adapter made of solid copper for improved durability and longevity 5-pack 3.5mm to 1/4 adapter allows a 6.35mm (1/4 inch) stereo port to accept a stereo cable with a standard 3.5mm (1/8 inch) plug The headphone jack adapter connects headphones to audio devices such as amplifiers or AV receivers with headphone jack