Monoprice 109767 3-Feet 3.5mm Stereo Male to RCA Stereo Male Gold Plated Cable for Mobile, Black So you've got a smartphone filled with your favorite tunes You put a case on your phone to protect it from scratches but now your 3.5 mm audio cable won't fit into the headphone jack The 3.5 mm connectors on this cable are designed with a 3 mm long by 6 mm diameter shank between the electrical connection and the connector housing