Eguller Core and overall. Some might have a 30 core, but overall will be in the 60's, for ex.. Can't test the core alone unless it's taken apart.
I've found 70-75 to be the best for me. But, I do play ProVx1 also, and they go longer than anything. Figure that one.
I did find 1 of these last time out, brand new, Played it the rest of the round. Very nice. But, same type(of performance) balls are out there for a lot less money; some may be 2 pc. but perform as these do.