[Suzerain of Sheol]

I don't know if I've ever actually seen a flail depicted accurately in any form of media. The heads were usually like half the size of an apple; you didn't need that much weight to cause a lot of damage and making the heads oversized like that would make the weapon unwieldable. The whole idea was to keep it constantly spinning in order to distract the enemy. They were usually one-handed (and hence, even lighter) so you could use a shield with them, as the weapon's pretty purely offensive besides trying to disarm with it.