Sand sticks to sides, but after turning upside down many times, works OK now. Nice assortment of sizes & colors.
When first got them, the sand particles stuck to the sides and wouldn't go all the way down. I was ready to return them, but after turning them upside down & letting the sand flow - several dozen times - works OK now. Maybe only a tiny drop of sand dust remains so they are OK. The case seems sturdy & should not break easily. Nice assortment of different colors & sizes.