Kolstein All Weather Bass Rosin
Kolstein all weather bass rosin (Ultra Bass or Arco bowing rosin) is a medium-hard formula. It comes in a silicon rubber cup to protect the rosin which can be peeled down before application. It is a harder dark amber formula in comparison to the Kolstein soft. This rosin can be used all year round with being overly sticky with a low dust production. A popular choice among professionals, teachers and students.