I bought them to clean parts from rust etc. in the nooks and crannies of my Chevy 57. The flat wheel types are pretty much useless. They'll shed all of their wires in about a minute, bouncing off your face, digging into your skin and clothing. They will sweep them off the ground for several days. My wife found one on the living room rug the other day, I pulled it out of my socks after they stabbed my leg. The cupped ones seem to last a little longer but still fall off pretty well, but I can actually use them more than once. Not bad I think for the price and the amount you get, you will need them! Just don't forget to wear safety goggles!
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