As long as the marble is rounded/smoothed down to the edges you'll have absolutely no problem in terms of paintball hits... dropping it on say concrete or accidentally hitting it into metal might cause some dings, but that doesn't really seem to be something I'd be worrying about if I had marble grips on my gear...
That said, marble SUCKS to try and work with
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Originally Posted by Spider!
I'm gonna pop some aggs.
Only got 20 rounds in my pocket.
Looking for some cover,
This is ****ing awesome.