Kolstein's Formulation Supreme double bass rosin is formulated from the finest ingredients and manufactured in a strictly controlled process. The resin is then aged according to the developed recipe, so that a high quality is achieved. The resin is available in a luxurious silicon packaging, which keeps the resin "fresh" for a long time. As with all Kolstein Formulation Supreme rosins, the double bass rosins have an almost unlimited life; in other words, the resin does not dry out and does not crystallize. Due to the manufacturing formula used, together with a lot of research and testing, the rosin has become a much sought-after item among (inter)national double bass musicians.