Who knew the earth is a 4-piece ball?

[tdc1]

Take that all you 2- and 3-piece balls!

[GregGarner]

If I'm understanding this correctly, that would actually mean it's FIVE-piece with THREE cores! (I appreciate the description of there being an 'inner core' and then an 'innermost' inner core...)

Seems reasonable that the early would have pretty high velocity off the driver, with TWO iron-nickel-alloy cores, but spin would be interesting. Pretty firm layer over a liquid dual-mantle, solid dual-core structure?

(Also super-excited for the plot-twist where it's not a new innermost core, it's just a gradient core technology like Titleist uses that is soft in the middle and gets firmer as you go out)