> [!CAUTION]
> **Caution:** This documentation is for Google Ads API **v24** . The latest active version is [**v26**](https://developers.google.com/google-ads/api/reference/rpc/latest/ExperimentArm.AssetDetail).

Details of an asset modification for the experiment ad, such as adding or removing the asset.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v24/resources/experiment_arm.proto)

| Fields ||
|---|---|
| ## `asset` | `string` The asset that is being modified for the experiment. |
| ## `asset_detail_operation` | `ExperimentAssetDetailOperation` Enum to specify whether the asset is removed or added from the base ad. |
| ## `field_type` | `AssetFieldType` Field type for the asset. |