# Shells
Shells are a unique Cwicly feature that allow you to create reusable collections of Tailwind classes to avoid repeated modifications to identical blocks. This is a game changer.
Since this is a new feature in Cwicly, it would be helpful to go through an example.
## Example
In the template below you can see the utility classes for each avatar image are repeated five separate times.
### Convert to Shell
* Select the avatar image block.
* Click the shell icon to open the Shell converter.
* A list of the current classes applied to your block will appear.
* If you already have applied a shell to the block, it will also appear as shells can nest other shells.
{% hint style="info" %}
By default, all Tailwind classes are selected for shelling.
{% endhint %}
### Select/Deselect
* To select or deselect, simply click on the desired class.
### Name
* Assign a suitable name.
* Click create or press enter.
{% hint style="info" %}
Notice all the selected classes have now been shelled into the Avatar shell.
{% endhint %}
### Inspect
* To inspect the contents of a shell, simply hover.
### Modify
* To modify the shell, click the Shell.
* Modify as required.
* Modify the shell’s name in the appropriate field.
### Exit
* To exit shell modification, simply click the back icon.
### Apply to other blocks
* Let’s apply the avatar shell to our other avatars.
* Right click the "+" icon to remove all classes.
* Click the "+" icon to open the class selector and select the required shell in the shell area.
* Any change you make to a shell will automatically and globally apply to all blocks.
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