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 0.7 million . 4) Volume of the closed solids = approx 738 mm3 for the pair. 5) Mesh is 3d printable and castable.6) The Current sizes of the ring are : 15.7 mm and 19.80 mm.7) Need any help , ready for modification.