[Mike Halliday]

are there 2 types of white brushes? I can't believe the brushes I use could damage a carpet. do they wear in?

[Ken Wainwright]

Yes they do Mike.

Especially whyen new, the tips of the "bristles" are square cut and more aggressive.

My Chipmunk brushes needed wearing in.  I have two sets of Gold brushes and even now after 15 months with the newer set, they're still a little more aggressive than my 5 year old ones.

Safe and happy cleaning
Ken