We bought these because the tips on our Dyson DC40 were wearing out. I've been using them for a few months now and they seem to be holding up well. Sometimes one side of the roller may appear to stop spinning, but this may be due to debris stuck to the rollers. Removing (usually hair) seems to work. The bristles also seem to be durable so far. I am happy with my purchase and will purchase more if needed.
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