# MaterialClass

> Kinbarrow modding reference — content tree `45d0fe274f851548`, version `0.2.0+main.c05ef2b`.

A material-class vocabulary row + its durability baselines.

**Note on syntax:** these files are RON, not JSON. The shapes below are exact,
but punctuation follows RON — read a real `data/*.ron` file alongside.

## Fields

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `hardness` | `uint32` | required | Object toughness = 10 + hardness + material bonus. |
| `id` | `string` | required |  |
| `integrity_per_lb` | `double` | required | Object hp = weight_lb × this × material factor. |
| `name` | `string` | required |  |
| `note` | `string` | required | Free prose gloss on the class. |