Back when men threw 16# black rubber bowling balls they did last for decades. Polyester balls are prone to chipping around the finger holes. Some people say that sort of damage is repairable. Some pro shops will say it's not worth fixing, just get a new one.
A true spare ball, one with a pancake weight block, doesn’t have anything that could be improved to make it better for making spares. Some companies keep trying to market plastic balls with dynamic cores as spare balls that can also be used as strike balls on dry lanes. I guess they’re looking for bowlers who don’t want to “ waste “ a spot in their bag on a ball that only works on spares.
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