Developed by a Juilliard trained professional cellist, Magic Rosin is a premium rosin for violin, viola, cello and bass. Made from only purified pine resins and endorsed by top soloists, professionals, teachers, and students, Magic Rosin has terrific grip while maintaining a clear and complex tone. Magic Rosin comes in two formulas: Magic Rosin 3G and Magic Rosin Ultra. For players who want even more grip and "pop," we recommend the Ultra Formula. Both formulas are used by all string players, though bassists and cellists tend to gravitate toward the Ultra.