Yumba Rosin - Tango in a formula designed for use on Cello. Yumba's Tango Line is ideal for those who need constant bowing attack. Ultra-soft and sticky, this Rosin is produced using ingredients of 100% vegetable origin to keep bow hairs intact and prevent staining. A few swipes of rosin cake is all that is needed to get full grip! 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.