> For the complete documentation index, see [llms.txt](https://docs.roboflow.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.roboflow.com/workflows/developer-guide/developer-guide/kinds/contours.md).

# contours Kind

List of numpy arrays where each array represents contour points.

List of numpy arrays where each array represents contour points

## Data representation

{% hint style="warning" %}
**Data representation**

This kind has a different internal and external representation. **External** representation is relevant for integration with your workflow, whereas **internal** one is an implementation detail useful for Workflows blocks development.
{% endhint %}

### External

External data representation is relevant for Workflows clients - it dictates what is the input and output format of data.

Type: `List[list]`

### Internal

Internal data representation is relevant for Workflows blocks creators - this is the type that will be provided by Execution Engine in runtime to the block that consumes input of this kind.

Type: `List[np.ndarray]`

## Details

This kind represents a value of a list of numpy arrays where each array represents contour points.

Example:

```
[
    np.array([[10, 10],
              [20, 20],
              [30, 30]], dtype=np.int32),
    np.array([[50, 50],
              [60, 60],
              [70, 70]], dtype=np.int32)
]
```