When held overhead with the fingertips of both hands and released, they will bounce off a regular concrete slab at about eye level. Roughly the same as the "Super Ball (R)" ball brand. Now, and even when I first opened the sealed package, I noticed they gave off very little smell or odor. These spheres are visible in the dark after absorbing some light. Consequently, the balls are visible well enough to be bounced and caught in total darkness. Of course, as you would expect, they will fade over time. Maybe there are similar products that shine brighter or last longer than this one, I don't know. I also can't say how this affects the production or the cost or other properties and qualities. They don't always jump straight, so they can fall off and get lost. The glow can make them easier to find when looking for them in the dark. They are not 1 inch or even 25mm in diameter as advertised. Their diameter hardly reaches 15/16" or 24 mm, albeit more. The seam of the mold is rough and pronounced. The painted "face" withstands normal wear and tear quite well. There is nothing wrong with the balls, that should recipients from have the expected amount of pleasure to receive for a fee.
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