bass viol wound D string, single length
medium gauge 2.70mm equivalent gut diameter
heavy gauge  2.80mm equivalent gut diameter
The F-Red Series are the new synthetic strings for bowed instruments, developed by Aquila Corde Armoniche as a valid alternative to natural gut.
Eco-sustainable, stable in intonation and durable.
Notice:
to avoid damages, do not cut the strings; in case you want to shorten them, first spread some quick glue around the point where you want to cut;
once installed, before you start playing them, it’s important to apply some rosin on the portion of the string that will come into contact with the bow.