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-3.38g 16.5mm-3.48g 17mm-3.58g 17.5mm-3.69g 18mm-3.79g 18.5mm-3.89g 19mm-3.99g 19.5mm-4.09g 20mm-4.19g 20.5mm-4.29g 21mm-4.4g 21.5mm-4.5g 22mm-4.6g. Width: 2.5mm. Thickness: 2mm.I will make to order with your parameters.