No, probably not brushless. At least, mine isn't. It's a 24V version from an electric bike. Mine is useless as a generator though, requires 1500+RPM, from memory.
I see these motors just about everywhere. Cheap Chinese stuff, but then, if the price is right, I won't complain
You plan to make a windgenny out of them, or why else have you bought a pallet of these? I can think of some applications, they're easy to mount too. Mine have 608 ball bearings, IIRC. 4 carbon brushes.
Peter.