These are very handy tools to clean your grinder inside and out.  Here are descriptions of each one...

Brush #1 (top of group photo) is made of boar hair which is coarse, and brush is long and flat

Brush #3 (bottom left) named beard brush, it is made of boar as well

Brush #4 (blonder wood on right) is made of horse hair which is softer 

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