Sound harbor 2 Pack Rosin for Violin Viola and Cello Rosin for Bows (2pack square box) Rosin is well suited for violin, viola and cello.Enables maximized projection and extra clear bow articulation Good quality, low dust, high viscosity is a little bit, make the instrument pronunciation sensitive, timbre Great grip and sound penetrating,Well suited for all kinds of steel and synthetic strings. Rosin with Good quality and low dust rosin protect human body against the harm Handmade soft rosin.Designed for violin, viola, cello