OSIS Rock Hard Ultra Strong Glue by Schwarzkopf Professional is una a hair glue with ultra-strong hold, ideal for creating bold looks and defining complex details. Its ultra-strong formula ensures una long-lasting fixation without weighing down, maintaining the natural flexibility of the hair. Perfect for extreme hairstyles and creative styling, this glue resists humidity and movement, ensuring control and precision throughout the day. A must for professionals and enthusiasts looking for impeccable results and una professional performance.