# Button Wrappers

Buttonwood wrappers are utility contracts that wrap ERC20 tokens to give them special behavior. This section outlines the implementation details and API interfaces for these contracts. 

### ButtonToken

A wrapper that creates a collateralized rebasing asset. 

{% content-ref url="/pages/F2nTBxO1b2lFSZu5cgrL" %}
[ButtonToken](/buttonwood/developers/button-wrappers/buttontoken.md)
{% endcontent-ref %}

### UnbuttonToken

A wrapper that turns a rebasing asset into a fixed-supply asset

{% content-ref url="/pages/pWNhMWiY4IPbP7D3SQIB" %}
[UnbuttonToken](/buttonwood/developers/button-wrappers/unbuttontoken.md)
{% endcontent-ref %}


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