These have some kind cosmetic blem, usually a test run in the printing or a filament change. 100% functional, magnetic mounting no mods required!!, they lock onto the fan bolts magnetically. no tools!  I also have a few acoustic vibration dampers that came out the wrong color or some other cosmetic issue for the same price. ASK!! power supply filters are almost done!! This material is sand and paintable if that is your thing, you want a different color here you go..