This collection of rings is ready for 3D printing.Ring sizes 18 18.5 19 19.5 20 20.5 21 21.5 mm. Approximate weight of rings by size(GOLD 14K): 18mm-10.46g 18.5mm-10.78g 19mm-11.08g 19.5mm-11.38g 20mm-11.66g 20.5mm-11.95g 21mm-12.24g 21.5mm-12.53g. Width: 11mm.