As stated above, its called a snake, which is basically many audio cords inside of one jacket. This particular snake has 1/4" trs connectors (the same connector as a stereo headphone). TRS stands for "tip ring sleeve". Each wire is made to carry a balanced audio signal. Unlike home audio which has a tip (center pin on rca connector) and a sleeve (combines - return audio path to complete audio circuit and ground/shield to protect the "hot" pin from emi / rfi noise from getting into the wire) this is a "balanced" cable which provides a separate +, -, and shield.
It could be used for unbalanced signals by combining the shield and ring (middle conductor of the wire) but usually this thin wire relies on the balancing of the signal for its high quality transfer, not having great shielding, so for short runs should be ok but if long (longer than ~15 feet?) there could be cross talk between channels or noise picked up If near an AC cord.
Used they are not worth too much money but brand new the cable could easily sell for 3 - 5 dollars per foot or more (and sometimes cables as long as a few hundred feet are used, particularly to connect a bunch of mics on a stage to a console at front of house, but these usually have XLR mic connectors on them and a box with panel mount connectors at one end; they also usually have a multi-pin connector (expensive!!) that disconnects the whole cable from the box or a rack), plus the cost of the connectors on the ends. Anybody with a studio into live music production could probably find some sort of use for this cable, as they will have the need to connect all the gear in a rack to a mixer. For 28-32 channels if it is 10-15 feet you should be able to easily get $30-$40 per cable for it, used, maybe more (I don't deal in the buying and selling very much and usually look for deals when I do; at that price you can move it quickly...) look up AUDIO SNAKE CABLE for more examples, and remember you have TRS (not TS or XLR) connectors.