Not too long ago I started using these duals in the game, and I think Ispeak for many when I say that they are the best duals in the game in general, both can put any enemy to sleep and this skin is based on Lullaby being the representation of a lullaby to put your enemies to sleep for life.
I must clarify that another reason why I decided to make this skin is that it is one of the few weapons that does not have its own skin in the game, more for the duals section.