175 feet per spool of .009 and .006 medical grade stainless steel, double polished, soft annealed wire.  Everthing about our wire is better than the normal everyday crafting or dubbing wire. Having the wire produced at medical grade means 98%+ impurity free. It makes a stronger brush and very little breakage when spinning and tying. Having the wire double polished avoids bunching of materials and an overall smoother spin. 
NMF dubbing brush wire is engineered and produced here in the United States