THE DUKE'S AIR FILTER FITS ECHO CS-590 CS-600P CS-620P

I have the upgraded air filter sealer kit bought from this website that has O-rings to keep fines from entering the engine (which is a factory defect of the cs-590) I ran the Dukes $10 fabric filter and it worked amazing. No particles getting past that thing. I bought these to try because they're cheaper and the first one I tried I got fines past the filter. So thinking it may have been a gap where this 2 piece filter mates. I put grease all around the mating surfaces and my O rings and still got fines inside on a new filter. So then it just comes down to the fact that the media in these filters will not stop the small particle fines from getting sucked into your bottom end. If you love your saw get the thicker fabric filter, not this chinsey saw killer.

it got

For the difference in price, they seem comparable to OEM.

Cheaper than the OEM, and washable.