# Hat Properties

Every hat has several properties:

* `id` - the integer identifier for the hat, which also serves as the [ERC1155-similar](https://docs.hatsprotocol.xyz/for-developers/hats-protocol-for-developers/erc1155-compatibility) token id
* `details` - arbitrary metadata about the hat; such as a name, description, and other properties like roles and responsibilities associated with the hat. Should not exceed 7,000 characters.
* `maxSupply` - the maximum number of addresses that can [wear](https://docs.hatsprotocol.xyz/for-developers/hats-protocol-for-developers/wearing-a-hat) the Hat at once
* `admin` - the hat that can issue the hat to wearers and can its hat's other properties
* `eligibility` - the address that controls eligibility criteria and whether a given wearer of the hat is in good standing
* `toggle` - the address that controls whether the hat is active
* `mutable` - whether the hat's properties can be changed by its admin
* `imageURI` - the URI for the image used in the Hat's ERC1155-similar token. Should not exceed 7,000 characters.

Refer to the subsequent sections for more information on each property.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.hatsprotocol.xyz/for-developers/hats-protocol-for-developers/hat-properties.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.