Foosball noise: can anything be done?

My new neighbors have a foosball table and they like playing it every evening. While I'm happy for their enjoyment, the noise is incredibly annoying and the constants clicking and rolling of the ball is really bothering me. I was wondering if there are any "quiet" balls that I might be able to buy for... show more My new neighbors have a foosball table and they like playing it every evening. While I'm happy for their enjoyment, the noise is incredibly annoying and the constants clicking and rolling of the ball is really bothering me. I was wondering if there are any "quiet" balls that I might be able to buy for them , or any other ways of making their game quieter.
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