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.
3 inch diameter 4 ohm 15 watt speaker with 2 mounting flanges used in many pinball machine backbox speaker panels. 4 inch hole to hole.
Depending on availability, speaker may be a slightly higher wattage and is considered an upgrade.
Reference:
Williams 5555-16223-00