Your site is well laid out, easy to find the products, uncluttered, and has exactly what it's about - could you teach everywhere else to be this good? It felt like browsing the local old-time toy shop.
Size is as-packaged, or the diameter of loose marbles. ("D" is the diameter of round items other than marbles.)
Transparent base speckled with blue and green. Coloring resembles the planet Earth, but continents are not printed on these glass marbles. 25 glass marbles (one of them is a 1" shooter!) with colorful printed header card. Don't forget something to keep the marbles in!