punk natural transparent rosin colophony suited violin cello viola and other bowed string instruments (1a)

high purity :rosin clarity transparency make stringed instruments pronuciation sensitive when playing strong adhesion:wipe with a bow hair,playing time longer and auxiliary improve play pure beautiful tone low dust: prevent the player from the harm of dust,and doesn't soften in warm weather encased in a sturdy finished wood block, convenient carrying and easy grip well suited for all kinds of synthetic strings?is music lover ideal select