These black resin bowls are size XL, and they fit the size 30 stones with plenty of room to spare.
There are 181 black and 180 white biconvex glass pieces. They are ~8mm thick, the black slightly larger than the white. They are most likely Japanese.
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.