To apply this popular method, you will always need a hook needle as well as a pair of pliers. If you need to put your cold fusion extensions back on, you will also need micro rings. Our micro rings have an inner silicone coating, which protects your hair and ensures that your extensions last longer. Here's how you do it: You insert the needle into the micro ring, after which you catch with the needle a small tot of your own hair which is passed through the micro ring. Once this is done, the cold fusion tot should be inserted into the micro ring and then the ring clamped together using pliers so that the ring is attached to your hair.