What are some clues that your rubber is warn out?

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If you clean the dust off the rubber after you play with a damp soft sponge, or an actual rubber cleaner, and kept the bat and rubber from direct sun-light or extreme heat or cold. It should last you at least 6 months to 1 year before you have to change. but this rubber life-span also depend on how hard and spiny you play and playing against, what rubber it is(Chinese, japanese, European, korean, etc) some rubbers are stronger than others.
 
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