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-1.59g 16mm-1.64g 16.5mm-1.68g 17mm-1.72g 17.5mm-1.78g 18mm-1.83g 18.5mm-1.88g 19mm-1.92g. I can make to order with your parameters.