As with all Kolstein Formulation Supreme Rosins, their bass rosins have the feature of indefinite shelf-life; that is, it will never dry out and crystallize. Once used, the rosin will show a continual wetting action allowing for easy powdering on the strings and instrument.
Kolstein Ultra Hard Bass Rosin
Through extensive research and experimentation, Kolstein Bass Rosin has attained this unique and revolutionary Formulation Supreme. The result is bass rosin which has been fully acclaimed by the finest international soloist and ultra-professional orchestral and recording artists.