I have never designed directly with a ferrite bead:
I want to wind my own inductor coils, and these seems useful for the fact that it has a ferrite core and some hefty leads coming out. I'd wrap my magnetic coil around the core and then solder the fine gauge mag wire to the leads. The final application would conveniently solder to the hefty leads.
My question is: Are the two leads part of the same conductor (a single wire fed through the ferrite core), or is there isolation between the two ends?