They work great. It's good to have plenty of these at a great price, even if they wear out quickly with heavy use. Even Dremel disc brushes can wear out quickly, that's the nature of the animal. The only thing you can remember is to print out the product detail page from Amazon so you can refer back to it to find out which color wheel corresponds to fineness/coarseness (e.g. ads give grit ratings for different colors).
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