Description
3/8″ ID White Rubber Ring
Most commonly used on jewel posts, as pictured.
Many places will sell you 5/16″ID for the plastic posts, they will work, but the rubber profile is not as thick=less bounce.(see comparison photo)
If you use 5/16 ID in areas such as the outlane, you will have a higher drain percentage.
These also work well as replacements on the Gottlieb double posts, which call for a 7/16″
Williams / Bally 23-6591
Gottlieb A-10217
Bally R-402