1) .Stl and .obj files are attched herewith. 2) There are 2 versions ans 2 sizes of the ring as per the picture.3) The total polygon count of mesh is 0.5 million. 4) Volume of the closed solid = approx 300 mm3. ( solid version ) and = 220 mm3 ( hollowed version )5) Hollowed Mesh is 3d printable and castable with minimum shell thickness of 0.60 mm. 6) The Current sizes of the rings are 17.5 and 18.5 mm 7) Need any help , ready for modification.