Okay, I meant literal half cylinders that are attached to the ring so that the main band has multiple curves from these half cylinders. The edges should also have bigger cylinders in them so that the ring is comfortable to put on and take off, and so that the the small and big cylinders have the same height in the top. This is what I want as the ring design:
Total width: 10 mm
Total height: 3 mm
Width main band: 4 mm
Height main band: 2 mm
Width middle gray cylinder: 3 mm
Height middle gray cylinder: 1 mm when cut off in half or quarters so that the half cylinder can be attached to the main band
Width edges pale copper cylinders: 3 mm, should be attached to the edges
Height edges pale copper cylinders: 3 mm because the extra 1 mm should match the height of the middle gray cylinder