I just read your review on the casaneo brush where you say

“Real squirrel brush hair cannot go back to their original shape after each stroke because the hair is too soft”

This is exactly what happens with my da Vinci brush - why do people use real squirrel brushes? They don’t swing back to shape! I don’t understand the benefit of this. I find it most annoying :D

I don’t have this problem with the nevskaya, isn’t that real sable as well