# Instantiate via

In coherence, it is possible to specify how a Prefab is instantiated at runtime using the **Instantiate via** option on the CoherenceSync component.

## Built-in instantiators

We support three implementations out of the box: Default, Pool or DestroyCoherenceSync, but you can also [create your own](#creating-your-own-instantiator).

### Default

This instantiator will create a new instance of your Prefab, and when the related network entity is destroyed, this Prefab instance will also be destroyed.

### Pool

This instantiator supports **object pooling**, instead of always creating and destroying instances, the pool instantiator will attempt to reuse existing instances. It has two options:

* **Max Size**: maximum size of the pool for this Prefab, instances that exceed the limit of the pool will be destroyed when returned.
* **Initial Size**: coherence will create this amount of instances on app startup.

### DestroyCoherenceSync

This instantiator will create a new instance for your Prefab, but instead of completely destroying the object when the related network entity is destroyed, it will destroy or disable the CoherenceSync component instead.

## Creating your own instantiator

You can implement the `INetworkObjectInstantiator` interface to create your custom implementations that will be used by coherence when it needs to instantiate a Prefab in the scene.

Custom implementations can be `Serializable` and have their own custom serialized data.

To begin, use the dropdown menu on the CoherenceSync and use the **Create Implementation...** option:

<figure><img src="https://215322450-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYYuUg3g2Mq8aiI7le9ai%2Fuploads%2Fgit-blob-ddcd286cb859860e2167beac353d846744d78c42%2FCreateOwnInstantiator.png?alt=media" alt="" width="563"><figcaption><p>Selecting a instantiator or creating your own</p></figcaption></figure>

Let coherence generate the scripts for you, and customise them as you see fit.

Once created, implementations of this interface will appear in the **Instantiate via** dropdown shown above, or in the corresponding CoherenceSyncObject asset.