Back in the day, Urethane was the new technology and they had different cores and balls like they do today.
Plus they were made to the ABC/USBC spec's used back then.
Before that the new technology was polyester (Plastic) balls. According to Don Johnson They looked at plastic balls back then , like we look resin balls today.
Don Johnson talked about how they snapped into the pocket (which shows how much lane conditions have changed today) and Glenn Allison made the comment back then that plastic carried more garbage hits than rubber. Which is just what was said today about resin balls.
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