As for the Brunswick - Twister Black (I think this was one of those ball's you saw in like K-Mart or Sports Authority type places.)
Specifications:
Line Twister
Color Black
Coverstock Urethane
Core Pancake
Factory finish Sanded
Weights 10 thru 16lbs
(1990's) Lane Conditions Medium-Heavy Oil
The Pearl I believe is just plastic ball, they came in multiple colors.
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