This collectible hardwood cased rosin honors Eugene Sartory (1871-1946), an innovator of French bowmaking. It is precisely blended to impart smooth playing characteristics and produce a very clean and clear sound quality. Each beautifully carved octagonal presentation box seals with magnetic closures and features a unique serial number. The generously sized cake is mounted on natural cork to protect from the elements and provide long lasting life. It is suitable for violin, viola, or cello and mkes a great gift!