DIY Audio Projects writes a DIY speaker cable project::
The cables use multiple stands of 16 AWG wire that is twisted together in alternating directions. The alternating cable geometry minimizes inductance. The multiple 16 AWG wires combine to create a cable with an equivalent cable gauge of 10, so resistance is also low. The result is a fine looking cable that delivers the performance of commercial cables at a fraction of the cost.
Note that he calls the oak sleeves at the end of the cable "decorative".