> [!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.AssetVariationInfo).

Details of asset variations to be performed on an ad in the control ad group.

[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_details[]` | `AssetDetail` Details for each asset that is being modified from the base ad. |
| ## `base_ad` | `string` Associated base ad resource name. |
| ## `base_ad_group` | `string` Associated base AdGroup resource name. |