How do they work?
They are where the Perfect/perfect hits come from. Top dot P/P flyball Middle dot P/P liner bottom dot P/P ground ball. Size of the dots depend on attributes
The bigger the dot, the bigger the sweet spot. A dot at the top would be for Fly Balls, in the middle would be line drives, and at the bottom would be ground balls. So a Joey Gallo(in theory, I've never used a Gallo card). would have the biggest dot at the top
The dots are to show what type of hitter is up. Power guy will have the middle and top dots bold, a balanced hitter will have the center dot bold, and a contact hitter will have the bottom two dots bold.