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# Projectile Data
Each [**Projectile**](/magic-pig-games/projectile-factory/projectile-factory-documentation/projectile.md) has a `ProjectileData` object attached to it. Many behaviors will make use of the *Speed* value on this object, to determine how fast the Projectile should move. The demo scene also utilizes the *Damage* value.
{% hint style="info" %}
If you create your own **Movement Behavior** (or other [**Behaviors**](/magic-pig-games/projectile-factory/projectile-factory-documentation/behaviors.md)), you do not have to make use of the data in **Projectile Data**. However, I would advise that you do utilize it, and also customize your own class which inherits from it, allowing more custom funcationality specific to your game.
{% endhint %}
Most likely you will want to create a new class which inherits from `ProjectileData`, and has additional data you need for your projectiles.
*Each game is unique.* **Projectile Factory** comes with the extensibility required to let you build **YOUR** game.
This is the "*Fast Projectile*" in the demo scene, and some projectiles use this to move faster than others. The **Damage** value is used when a projectile collides with the **Demo Target**. Check the console, and the script, to see how.
## Custom Class Example
The ProjectileDataDemoDamageOverTime inherits from ProjectileData, and is used for demo projectiles like lasers and flame throwers, which likely cause damage over time rather than per collision.
```csharp
namespace MagicPigGames.Projectiles
{
[CreateAssetMenu(fileName = "New Damage over Time Projectile Data", menuName = "Projectile System/Projectile Data - Demo Damage Over Time")]
[System.Serializable]
public class ProjectileDataDemoDamageOverTime : ProjectileData
{
protected override float CalculateDamage() => damage * Time.deltaTime;
}
}
```
Here we update the `CreateAssetMenu` options, so that you can create new `Scriptable Objects` of this type, and override the `CalculateDamage()` method, multiplying it b y `Time.deltaTime`.
Your custom classes can go deeper, if you'd like, connecting your projectiles to your game data and stats, and even adding additional `Properties` that work with your custom [**Behaviors**](/magic-pig-games/projectile-factory/projectile-factory-documentation/behaviors.md) specific to your game.
---
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