Received lightening fast. Compared side by side with another made in USA and the filter material and pleats look identical. The cardboard support mesh has a slightly different design but at as least as strong.
I would not recommend this filter. It is not truly 4 inches. My 3M 20x20x4 filter filled up the entire space, where as this filter left a huge gap since its not a true 4 inches. Go for 3M instead; its worth the money.
The filters were not the quality that I expected and they were not deep enough to fit my filter space. I called Filterbuy for a return, they were not accepting returns but they did credit my account. I was able to find someone that could use them.
[This review was collected as part of a promotion.] My apartment complex offers filters fir free. Think they are trying to kill us all. They are the worst. They also dont fit properly. The filters I buy from you, fit like a glove and I actually can breath clean air. Best filters for my COPD.