One of the balls, however, is slightly heavier or slightly lighter than the others, but you don’t know which ball or whether it is heavier or lighter. You do, however, have a balance scale.

Aramith 2-1/4" Regulation Size Billiard/Pool Ball: Super Pro Cup Cue Ball with 6 Red Dots Aramith 967 ratings ...

A table can tell the difference in one of two ways: Either the cue ball is slightly larger—usually about 1/8-inch bigger in diameter than the standard 2.25-inch billiard ball—or it’s housing ...