Hot fusion with adhesive. We use premium Italian keratin to create our extensions. Each strand weighs 1 g. The installation is done strand by strand. Our keratin strands can easily be cut in half to create mini keratin strands. This technique must be performed by a professional and is suitable for several hair types. The longevity of keratin installations varies depending on hair density, generally lasting 2 to 5 months. Our packs contain 25 strands for a total of 25 g, meaning 1 g per strand.