These resin bowls are size L, and they fit the size 20 stones with plenty of room to spare. One lid was replaced so it isn't a perfect match.
There are 181 black and 170 white biconvex glass pieces. They are 5mm thick, the black slightly wider than the white. They are most likely Korean, as they are just slightly thinner than standard 22mm width (about 21.3mm).
This is a Vintage item.
This item ships from Colorado, USA via UPS or USPS. Within 3 business days of purchase you will be emailed a tracking number that you can use to sign up for notifications. 3.9lbs 7x7x7