I checked these nozzles when they arrived and none of them had any burrs or other manufacturing defects that I could find. I've used one of the 0.2mm nozzles on my Ender 3 V2 for about 100 hours and it's not showing any noticeable signs of wear yet. Other nozzles I've ordered in the past wore out after just a few prints. For the price you can't beat them.
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