Motorcycle tires rings set.
UPDATED (August 17 2021): added zip-archive with visually the same rings, but with deeper creases/groves of the protector pattern (0.6mm instead of original 0.3mm). For people who has problems with casting or for people who uses sanding paper and polishing disks too actively ;)
Sizes present: from 16 to 22mm.
volume varies from 581mm^3 for 16mm to 762m^3 for 22m ring. So weight for sterling silver also varies from 5.8 to 7.6g. All info about models is shown on screenshot(thumbnails)