# SurfaceCase

> The surface_case block of a .well file: a list of SurfaceCase objects.

Property `surface_case` of the .well root, an array of objects, required. [Defined in the spec](/format/spec/v2/object-schemas#surfacecase--surface_case).

| Field | Type | Required | Values / constraints | Description |
| --- | --- | --- | --- | --- |
| `from` | number | yes |  |  |
| `to` | number | yes |  |  |
| `diameter` | number | yes |  |  |