Thin insulation and a tight, smooth outer jacket make this wire perfect for running along joists and inside walls. The conductors are made up of many fine strands, a sign of quality.
I agree with the people who have commented on how stiff the wire is . A little more flexibility would make it easier to handle. But when you strip the away the outer jacket, the wire pair inside is a lot more flexible. I guess the stiffness protects them from damage during runs. Take it off as soon it enters the wall box and you have a pair that's much easier to work with.
I purchased the Nimbus series in 16AWG and my end use is speaker wire. It was a great price for 100 foot spool. If you need speaker wire it's a no brainer, this should suit almost any application because it has red/black color coded inner jackets and a black outer jacket.
PROS: Black outer jacket, oxygen free copper
CONS: Did not specify number of strands per conductor