The game is sometimes played with the larger and heavier (and unnumbered) carom billiard balls instead of pocket billiard balls. Such is the case at the Union Club and was also at the University of Michigan Billiards & Games Room, where the faculty devoted most of their time to bottle pool. Not incidentally three-cushion billiards, which uses these larger balls, was also a mainstay in that room and touring three-cushion professional Carl Conlon was a fixture there until his death in 1997. In this variation, a solid-yellow (or dotted) second cue ball is used in place of the 1 ball, and the red ball, known traditionally as the , is used in place of the 2 ball. The use of such balls makes scoring by caroms easier, but makes pocketing balls (and scratching) more difficult because the larger balls must still be made in the ordinarily-sized pool pockets.