Rosin is made from tree sap and creates friction between the strings and the bow. Rosin causes the bow hair to stick to the string and pull it, which in turn creates the sound. It’s a good idea to keep a spare rosin stashed away in case it is misplaced or dropped. Simply for Strings stocks a wide range of accessories for violin. Our huge range of accessories covers shoulder rests, music stands, rosins, mutes, humidifiers, Bow Hold Buddies and more. Make your choice from accessories manufactured by Pirastro, Melos, Kun, Everest, Manhasset, Hercules, Things 4 Strings and many more.