I bought these balls for the Marble Race hand. I bought a set of 160 pieces knowing I would only need about 20 pieces. I was SHOCKED at how much I had to give up before I found a handful round enough to roll straight! Many of them were clearly "not round," and many others did not maintain a straight line as they rolled. I didn't count, but I think I managed half of it before I found 20, rolling just enough to keep from falling off the trail of our marble trail. (No, that wasn't a problem with the lanes. All lanes were VERY even and larger than the ball itself, so the balls that fell were NOT round at all). In any case we didn't send them back or ask for a refund as with a set of 160 I met my purchase goal of only needing around 20. But be careful buyers, the set I received was disappointing and I wouldn't buy it again.
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