Not yet used but just by touching the bristles I can tell, it should be one of the most gentle to the car interior that exists on the market. One thing I've noticed, as non-professional. The metal post that is supposed to be attached to a professional polishing machine has thread. This is something professionals most likely know by heart and I'm not blaming the seller here for not disclosing that. I didn't know it and I wanted to use it with my cordless drill. I'm still figuring out a way of how to use it without damaging the thread. Maybe I'll just put it in, tighten it up and don't worry about the thread at all, since I don't have a professional polisher and will only use it with the cordless drill. It just hearts me to damage such a good piece of equipment. Please fellow unprofessionals be mindful of that.