Cold fusion technique is a method without the use of glue or heat. Installation is done strand by strand, which makes it extremely light for natural hair. Our wraps contain 25 strands for a total of 25g, or 1g per strand. Perfect for people with very fine to normal hair, this technique offers remarkable comfort and discretion. Installation is very similar to standard micro rings, but the head of the extensions is 90% smaller than a regular micro ring, making it ideal for people with extremely fine hair. This method must be applied by a professional.