Originally, Floyd Thayer called these "rough" billiard balls. They were designed to give the magician a better grip on them unlike the standard smooth sets of multiplying billiard balls. For that reason and because he was a marketing genius, he named them Clingo.
Each ball is scored with concentric circles spaced evenly. They are very rare in any condition. These are in fine condition. And Floyd Thayer turned them. No one else. No one else could.
Price is $3600. Click photo to enlarge.