Yes, Ben Wa balls are safe in water. For more information visit
ben-wa-balls.org/ben-wa-balls-faq
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A Ben Wa ball is one of a pair of balls, usually hollow and
containing a small weight which rolls around, used for sexual
stimulation of the vagina.
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Ben Wa balls are sexual toys. They consist of a ball within a
hollow ball that moves randomly, making it difficult to get
accustomed to the stimulation.
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Ben Wa balls are used for sexual stimulation for adults. They
are usually inserted and are thought to provide pleasure for the
recipient. They offer no therapeutic relief.