Two of the three pieces in this set are of good quality. The cleaning "ball" is copper, not brass as I'm used to seeing. I'm not very familiar with the differences between the two as it involves removing excess solder from your iron, but for those who do I advise. The bin is very light and if you don't have a way to keep it in place at your work station, it will be pushed around during cleaning. For me personally there are no problems. It hasn't capsized yet, which it should have done. The glass of flux that comes with the kit is decent. It wets very well when heated and does not appear to be very aggressive, but its activation level is not specified, nor are its specific ingredients. I like it, but I leave it for non-sensitive components. As for the last element, the soldering roller, I have a less extravagant opinion. It's enough for last year, but I don't care about its properties. It's a VERY thin wire, meaning you'll use up a decent length of it at a time. It doesn't wet well and is VERY easy to oxidize. I've found that if you don't apply a fair amount of flux to the components beforehand, it tends to clump and roll/smudge rather than stick to your finish. For the price you get a lot more than what you pay for.
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