This Natural Dark Rosin by D'Addario is crafted from all-natural ingredients, ensuring a high-quality product for musicians. The dark rosin is suitable for both horsehair and synthetic hair bows, providing excellent grip and performance. The included plastic channel allows for easy handling and application, making it a convenient choice for players of all levels. Whether you're a beginner or a seasoned professional, this rosin will enhance your playing experience by delivering a smooth and consistent sound.