UnityChanKAGURA_URP_2019.4/Packages/com.unity.springbone/Runtime/Components/DynamicsNull.cs

using UnityEngine;

namespace Unity.Animations.SpringBones
{
    public class DynamicsNull : MonoBehaviour
    {
        // This class does nothing. It just indicates that the object was created for dynamics purposes
        // and should be saved with dynamics information.
    }
}