Quote:
Originally Posted by toyobaru
I think the tennis balls with the dots on them are just a normal tennis ball with a bingo marker mark on them. I noticed most tennis instructors do this with their classes.
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Quote:
Originally Posted by TOS'd
OP, go to a dollarstore and buy some $1 bingo markers if you already have some tennis balls and you just want to mark them.
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Actually they are Tennis balls that are 25% slower than normal tennis balls. Thanks anyways