I wanted 8.5 inch diameter balls and that is 7.5, the description says 8.5. Pi x D = Circumference so Circumference / Pi = D. See photo for 23.25" Circumference. These balls are sticky from mold or something and really stink of chemicals; I was starting to have a headache. The little pump is good but your local dollar store probably has the same dollar balls.Sent back due to stickiness and smell.
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