All about the music created when the bow of any stringed instrument is 'bounced' on the strings.  Harder than it would seem.  Like dyeing this particular colourway.  Technique, then practice, practice.

Fingering weight (80% merino 20% nylon)

366m/430yd skeins

110g/3.9oz

2.25-3.25mm/1-3US

27-32 sts/10mm/4"