Yumba Rosin - Bee Line in a formula designed for use on Cello. Yumba's Bee Line is for professional orchestra musicians and soloists. Dark red in color, this Rosin is produced using ingredients of 100% vegetable origin to keep bow hairs intact and prevent staining. Yumba Rosins are developed in Argentina, for year-round use in all climates with a protective metal case. Pure Beeswax preserves humidity in the bow hair.