# mouseWheelScrollSize

> This property controls the scrolling speed only when using a mouse scroll wheel, based on the size of the page. It takes precedence over the --unity-metrics-single_line-height USS variable.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine.UIElements](/engine/6000.0/script-reference/unityengine/uielements.md)
* **Assembly:** UnityEngine.UIElementsModule

```csharp
[CreateProperty]
public float mouseWheelScrollSize { get; set; }
```