Glossary · equipment
Ball
The small ball launched along the track against the rotor. Modern balls are ivorine or Teflon, 18–21 mm.
In context
Ball size changes how much it bounces: a smaller ball rattles longer between fretsequipmentFretThe metal divider between two pockets on the wheel.Read full → before settling. Studios switch sizes to vary behavior.
Did you know
Ivory balls were used until the mid-20th century; collectors still call the synthetic ones “ivorine”, the trade name for a celluloid substitute from the 1890s.