Aramith measel cueball size

Regulation balls are 2 1/4 inch in diameter. Aramith balls are held to very
close tolerances and Brunswick balls are made by the same company.

Put the measel ball between 2 Burnswick and place a ruler over all 3 balls.
The ruler should touch all 3 balls if they are the same size.

They are all the same size when new.

They change size after years of play.

The cue ball might be slightly larger is it's newer.

What branpureza noted is especially true of cue balls, and one-balls where rotation games are played a lot.

The problem mentioned is accelerated if the balls are polished regularly in a mechanical ball polisher.

The resin compound in the newest Aramith balls has a more consistent density than that used previously. There will still be shrinkage due to friction and wear, but as the technology and manufacturing processes are refined, the rate of surface attrition is reduced. A new set of Aramith balls will take longer again to get to the same worn state. This generation's balls are likely to outlast the players.