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-1.58g 16-1.6g 16.5-1.64g 17-1.68g 17.5-1.72g 18-1.76g 18.5-1.79g 19-1.83g. I can make to order with your parameters.