`RECTANGLE_HEIGHT_250` for Android is available according to official Meta documentation: https://developers.facebook.com/docs/audience-network/setting-up/ad-setup/android/banner It is `kFBAdSizeHeight250Rectangle` for iOS: https://developers.facebook.com/docs/audience-network/setting-up/ad-setup/ios/banner > This format is best suited for scrollable feeds or end-of-level screens > This format is highly recommended because it provides higher performance, higher quality, and more CPU efficient