Rinastore Rosin For Violin/Viola/Cello String Natural Rosin Handmade soft rosin,Low dust forming,the most stringent quality controls. The rosin after improvement, single-mould formation that does not easily fall apart. Great grip and sound penetrating make the voice is brightness,mellowness and powerful. The rosin in Box and convenient carrying and use. Well suited for all kinds of steel and synthetic strings.