I think your marble site is wonderful. I am so pleased to be able to find real rock crystal marbles. I use them in jewelry making. Finding 1/2" to 3/4" undrilled rock crystal beads has been nearly impossible. I'm glad I finally found a source.
Size is as-packaged, or the diameter of loose marbles. ("D" is the diameter of round items other than marbles.)
25 glass marbles (one of them is a 1 inch shooter!) packed in a net with colorful themed header card printed with fun facts and game rules. Mega Bots have a white base with swirls of blue and red on the surface of each marble. They are iridized to have an extremely shiny, reflective surface. Mega Marbles nets are perfect because each child can have their own unique marbles. Don't forget something to keep the marbles in!