The diagonal inertia tensor of mass relative to the center of mass.

The inertia tensor is rotated by the inertiaTensorRotation. If you don't set intertia tensor from a script it will be calculated automatically from all colliders attached to the rigidbody.

	// The inertia tensor of a long brick
	rigidbody.inertiaTensor = Vector3(5, 1, 1);

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Example() {
        rigidbody.inertiaTensor = new Vector3(5, 1, 1);
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Example() as void:
		rigidbody.inertiaTensor = Vector3(5, 1, 1)