Size is as-packaged, or the diameter of loose marbles. ("D" is the diameter of round items other than marbles.)
These metallic marbles only look like they are big metal balls. They have an iridescent finish which creates a surface tinted in colors like blues, greens and purples. This Jumbo is a Toebreaker, the biggest size marble made. Jumbos are used in target marble games where players try to hit the jumbo instead of hit game marbles out of a ring or into a hole.
I actually made a marble trophy using this marble. I broke down an old bowling trophy I picked up at a 2nd hand store, and mounted this marble on top. I have marble contests with the grand kids and the winner gets to display the trophy. They love it.
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