Depends on what your referring to. Modern balls actually hold thier surface better than the older urethane balls (try keeping a ball at 400 grit for a couple of games) but they soak oil up much faster than urethane. I also tend to think the thicker covers on older balls tended to crack less. Now how the softer plastics held up that were popular before urethane was before my time. I think rubber balls basically lasted forever.
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