This collection of rings is ready for 3D printing.Ring sizes 15.5 16 16.5 17 17.5 18 18.5 19 mm. Approximate weight of rings by size(GOLD 14K): 15.5mm-2.4g 16mm-2.44g 16.5mm-2.49g 17mm-2.53g 17.5mm-2.58g 18mm-2.63g 18.5mm-2.67g 19mm-2.72g. I can make to order with your parameters.