Shielded barrel connector. 3.5 mm stereo jack to 3.5 mm stereo jack. Nickel over Brass.
1/4 Phone Female-Female Barrel
1/4 Phone Male to Mini Phone Female Audio Adaptor
3.5mm Female to 2.5mm Male Audio Adapter
3.5mm Mini Phone Male to RCA Female
3.5mm Mini Stereo Female-Female Adapter