CALIFORNIA WARNING: This product can expose you to chemicals, including lead and DEHP, which are known to the State of California to cause cancer and birth defects, or other reproductive harm. For more information, go to https://www.p65warnings.ca.gov.
PRW® brand white rubber O-ring. The most common bumper size, used on all plastic posts by all manufacturers.
Inner diameter is .31 inches (7.9mm) and the cross sectional diameter is standard 3/16 inch (4.7mm).
Why PRW® rubber?
PRW® rubber is the industry standard elastomer for playfield bumper durability, rebound response, and aesthetics.
Years of pinball playfield mechanical and chemical engineering experience have created this unique elastomer compound that combines NBR (nitrile butadene), SBR (styrene butadene), and pure latex for a rugged, attractive bumper that combines long life and better bounce.
Reference:
Allied Leisure 264-8-100
Alvin G RBR-025
Bally R-243
Chicago Coin 6060
Jersey Jack Pinball (JJP) 25-002003-05-09
Marco 38-0516
Midway 0017-00041-0637, 17-41-637
Game Plan 08-30004N
Gottlieb A-10217
Sentinel 644031-2
Sega/Stern/Data East 545-5025-02
Stern S.E.I. 7A-120-031, 7A-135
Stern S.P.I. 545-5348-52
Valley 66-380-002
Williams 23-6300
Wico 19-008100
Zaccaria A4246