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+# Shell
+
+`Shell` is not part of the stable SimpleCADAPI 2.0 beta public wrapper surface.
+
+Use `Face` for bounded surfaces and `Solid` for closed 3D bodies. For thin-walled parts, use the public feature operation:
+
+```python
+shelled = shell_rsolid(solid, faces_to_remove, thickness)
+```
+
+See [`shell_rsolid`](../api/shell_rsolid.md) for the stable public operation.