The solo gauges are assuming a pitch of a-440.
This is a single length gut core string with a silver-plated copper wire winding and a thin silk layer wound onto the core between the gut and wire. Because of the plating, the wire is left round so that you can feel the texture of the tops of the wire. The tone is quick and bright. The end of the string that goes into the tailpiece is knotted with a loop of gut on the end.
Wound strings for the contra bass are warranted for a period of six months from the date of shipping.