This is "architectural" cable, I suspect, meaning that it is designed for installation in buildings. Conduits, raceways, plenums. etc. As such, it may be more stiff or inflexible, and prone to holding its shape as opposed to the shape you would like it to assume. In my experience, the Teflon-jacketed architectural cable can be very obstinate about its shape!
Other than that, though, West Penn is a good, old manufacturer of wire and cable, and has been doing the Teflon stuff for at least three decades that I know about. In fact, I would be very surprised if you hadn't actually heard a mic signal running through this very cable in an auditorium somewhere, if it had to run outside of a conduit at any point.