Size is as-packaged, or the diameter of loose marbles. ("D" is the diameter of round items other than marbles.)
We have produced our top-selling glow-in-the-dark snowball marble in a shooter size! This shooter is the focus of the attention whenever it is pulled out. Charge it by placing it in full sun or near a bulb and it will glow for hours. Try using them as novel game board marbles or to play in the dark!.