Carlsson is an extremely popular dark rosin for double bass that's made in Sweden and is one of the most sought after rosins in both North America and the United Kingdom.
Medium-soft in texture, perfect for winter months, Carlsson Bass Rosin comes in a foil cup within a plastic lid container, and can help the bassist obtain that big, rich sound from their bow.
Similar to Nyman rosin, also from Sweden, Carlsson is slightly softer and therefore a lot of bassists choose Nyman for the summer, and Carlsson for the winter.