# BillingSubscriptionItemSeats

> Billing is currently in Beta and its APIs are experimental and may undergo breaking changes. To mitigate potential disruptions, we recommend [pinning](https://clerk.com/docs/pinning.md?sdk=expo) your SDK and `clerk-js` package versions.

The `BillingSubscriptionItemSeats` type represents seat entitlements attached to a subscription item.

## Properties

| Property                         | Type                                                                                                                            | Description                                                                                  |
| -------------------------------- | ------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------- |
| <a id="quantity"></a> `quantity` | `null | number`                                                                                                      | The seat limit active while the parent subscription item was active. `null` means unlimited. |
| <a id="tiers"></a> `tiers?`      | <code><a href="https://clerk.com/docs/expo/reference/types/billing-per-unit-total-tier.md">BillingPerUnitTotalTier</a>[]</code> | The tier-level breakdown of seats for this subscription item.                                |

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