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Wow, thanks to both senior moderators for this explanation. I feel like I learned something new now.;)

Ok. So, if I understand this correctly, a brush that has more hair, has more "backbone" (?).

I am not sure if I understand the term backbone. From what I've read, some backbone seems to be a desirable feature of a good brush. Yet, silvertip brushes are softer (less backbone?) than pure...