The D'Addario Violin Rosin, Cello Rosin, and Kaplan Premium Dark Rosin offers a professional quality companion for your violin, viola, or cello. This complete package includes horsehair and synthetic bow rosins for superior performance and control. The D'Addario Violin Rosin gives a rich, warm sound that glues the bow hair securely, ensuring an even, consistent sound. The Cello Rosin is perfect for creating a smooth, silky sound that's both easy on the bow and the instrument. And the Kaplan Premium Dark Rosin is a powerhouse for serious players, providing enhanced grip and a deep, rich tone. The included case keeps your rosins safe and organized, making it easy to switch between bows when needed. Choose D'Addario for superior sound and performance, the choice of professionals for generations.