This collection of rings is ready for 3D printing.Ring sizes 16 16.5 17 17.5 18 18.5 19 19.5 20 20.5 21 21.5 22 mm. Approximate weight of rings by size(GOLD 14K): 16mm-9.66g 16.5mm-9.96g 17mm-10.26g 17.5mm-10.56g 18mm-10.86g 18.5mm-11.16g 19mm-11.46g 19.5mm-11.76g 20mm-12.07g 20.5mm-12.37g 21mm-12.67g 21.5mm-12.97g 22mm-13.27g. Width: 7.5mm. Thickness: 2mm.I will make to order with your parameters.