# Hardness

Hardness is a float value used to calculate the breaking speed of the machine block.

The higher the hardness the longer the breaking time.

The default hardness is 3.5.

{% hint style="info" %}
A hardness of -1 will make the block unbreakable (like bedrock).
{% endhint %}

Some comparisons with vanilla blocks : 

* Wool : 0.8
* Stone : 1.5
* Dirt : 0.5
* Obsidian : 50
* Netherrack : 0.4
* End stone : 3

#### Example

```json5
"appearance": {
    "hardness": 42
}
```