The product shipped quickly. However, there were only 4 filters in the package instead of 5. The filters are a little long for my Vicks 3900, but I could smash one in there. There is one that is about an inch longer than the others and I'm not sure it will fit. With only receiving 4, it's not the deal it seems to be. It's too much trouble to get a refund. I will buy somewhere else next time.