This ultra-soft Yumba Tango Ultra Sticky bass rosin has a powerful hold. Perfect for solo work, as well as for ensemble and orchestral players. Natural artisanal materials. Made from pine resin tapped in the forests of Argentina; one of the most unique natural rosins in the world. Pure plant-based ingredients keep your bow hairs stronger and cleaner. And an innovative silicone container keeps the humidity level of the rosin consistent – no cracking or drying.