I really liked these, especially for the price. They are in fact solid brass, unlike many others which are actually brass plated steel. I have used them on both steel and aluminum small engine parts and they have not damaged them. They also did a pretty good job of removing old dirt and such. They even polished the metal a bit, which surprised me. Unfortunately, they didn't do much with the paint, but some kind of airplane wash helped me with that. I really liked the different sizes and shapes, although the wheels seem to work better than the cups. After a while, pieces of brass wire fell off, but they didn't fall apart. I must have used them fairly consistently for an hour or two, switch between them and they're still good enough to use again. They fell apart after so much use, but I guess that's to be expected. In any case, it's a good option at a very reasonable price, especially since they're made of solid brass.
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