# Material Libraries

Material libraries are used to assign physical materials to objects in your models. Currently Qonic comes with one default library template containing some commonly used construction materials. This library can be edited and extended. To edit a material, right-click it or use the action menu at the bottom of your screen after selecting it. You can define a new color, name and optionally a category of the material. To add a new material, click the green + button on the bottom right of the screen.

<div data-with-frame="true"><figure><img src="/files/2Ln6ys5pec0207rOnXbf" alt="" width="509"><figcaption></figcaption></figure></div>

Once a material library is added to the project you can open and view it, or you can start using them in models using tools such as [Add Layer](/documentation/qonic-application/modeling/modifying/material-layer-editing/add-layer.md) or [Replace with Layer](/documentation/qonic-application/modeling/modifying/material-layer-editing/replace-with-layer.md).

**Note:** when removing a material that is referenced in one or more models, you are effectively removing data from that model. Do this with caution, as this change is irreversible.


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