They are also called RCA cables, stereo audio cables, or interconnects.
Check out the Blue Jeans Cable LC-1-
$31.25 for a 3 footer. If you click on "design notes," you can read all about why they built the cable the way they did- thickness of the conductor, solid vs stranded, type of dielectric. They list the cable specs (capacitance, resistance, and so on). It's shielded and uses high quality RCA...