![I've noticed these marks near the bolts on my longboard. What exactly causes them, and are they bad? Thank you : r/longboarding I've noticed these marks near the bolts on my longboard. What exactly causes them, and are they bad? Thank you : r/longboarding](https://i.redd.it/ukgo3dbfzxj41.jpg)
I've noticed these marks near the bolts on my longboard. What exactly causes them, and are they bad? Thank you : r/longboarding
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