I've used steel and brass brushes and they work great! They're a bit thinner than the other 3 sets of brushes I have and they suit me as I mostly cleaned electronics and 12v power connections. The bristles grip securely in the handles and the shape allows you to get to hard-to-reach areas to get jobs. softer than my other set but they seem to spring better and haven't formed strands that separate from the main brush yet. This makes them best for fine cleaning and not so good for heavy rust removal. The pens are rubber coated when they help with grip but can be a negative if they break when heated like some other rubber coated pens I have. It was. I keep them in a barn that hits the mid 90's daily in the summer and will update this review later when they get a chance to cook! My first few uses were great and I recommend them!
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