This is the second time I have ordered from you and have received quality products and prompt service. You have even offered to help on shipping with this order which is a great relief to me. Thank you for being a quality business.
Size is as-packaged, or the diameter of loose marbles. ("D" is the diameter of round items other than marbles.)
Hard plastic display rings with a 5/8" outer diameter and a 1/2" inner diameter are suitable for 3/4" and larger marbles and won't scratch like washers or other metal or glass stands will. Packed 12 to a bag.