If you're looking for filters, try aliexpress that's where moondrop sell most their things
Headphones
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Yes I know, but I'm looking for filter for my KATO, the KXXS could fit the KATO, but it looks different with the original filter, only the ARIA looks the same, but I'm not sure with the size of ARIA filter, if it's 4.0mm then it won't fit on the KATO nozzle...
According to my measurements, it's 4.0mm.
I just measured the spare filters with my vernier caliper.
Bent mine a bit while removing, so it may not be the most accurate measurement. Still, it's a bit over 4 mm.
You can purchase replacement nozzles/filters for the Kato from the Moondrop Official Store on Aliexpress. See:
https://www.aliexpress.us/item/3256803559403072.html
Alternatively, the 4.0mm diameters dust filters from either of the following two Aliexpress stores should work just fine since the Kato filters are merely dust and earwax filters and are not meant to significantly affect tuning: