The Rosin Spreader is a simple and effective solution to enhance the quality of your daily stringed instrument playing experience. It is designed to be conveniently attached to the bottom of the Cecilia rosin after each use. The spreader thoroughly settles rosin particles between the strands of bow hair after first application on a fresh rehair Evenly distributes the rosin particles on the bow hair after each application for improved response Removes excessive rosin on the hair and reduces build ups