I was very impressed with your website. Found exactly what I needed to replace missing marbles for a game that I have. Also, I found some fun stuff for my grandchildren to play with while looking at this site.
Size is as-packaged, or the diameter of loose marbles. ("D" is the diameter of round items other than marbles.)
This pocket-friendly Golden Rule marble is 7/8" in diameter, instead of the usual 1" diameter. It makes a difference to those who like to carry and hand these out! The Golden Rule is printed on 2 lines; "Do unto others as you would have others do unto you."