# WellScreen

> The well_screen block of a .well file: a list of WellScreen objects.

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

| Field | Type | Required | Values / constraints | Description |
| --- | --- | --- | --- | --- |
| `from` | number | yes |  |  |
| `to` | number | yes |  |  |
| `type` | string | yes |  |  |
| `diameter` | number | yes |  |  |
| `screen_slot` | number | yes |  |  |
| `slot_type` | string | no |  |  |