1) .Stl and .obj files are attched herewith. 2) The Rings are solid and suitable for investment casting. 3) The total polygon count of mesh is 0.5 million each.4) Volume of the closed solids = approx 820 mm3 for single ring. 5) Mesh is 3d printable and castable. 6) The Current size of the ring are 16.8 and 19.5 mm. 7) Need any help , ready for modification.