This collection of rings is ready for 3D printing.Ring sizes 15.5 16 16.5 17 17.5 18 18.5 19 19.5 mm. Approximate weight of rings by size(GOLD 14K): 15.5mm-2.72g 16mm-2.8g 16.5mm-2.88g 17mm-2.96g 17.5mm-3.05g 18mm-3.13g 18.5mm-3.21g 19mm-3.29g 19.5mm-3.37g.Width - 3mm. Thickness - 1.5mm.