# Metaobjects and metafields

### Metaobjects

Use the type to reference a metaobject.

[Referencing metaobjects](https://help.shopify.com/en/manual/custom-data/metaobjects/referencing-metaobjects)

#### Product tags

The type for the metaobject. Leave blank to ommit.

### Product metafields

#### Subtitle

The namespace and key for the metafield. Leave blank to ommit.

#### Size chart

The namespace and key for the metafield. Leave blank to ommit.

### Collection metafields

#### Inline media

The namespace and key for the metafield. Leave blank to ommit.

#### Inline media link

The namespace and key for the metafield. Leave blank to ommit.

### Blog post metafields

#### Blog post products

The namespace and key for the metafield. Leave blank to ommit.

### Market metafields

#### Free shipping threshold

The namespace and key for the metafield. Leave blank to ommit.


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