These filters snap onto the top of my Eureka Boss 4D with some effort, unlike another replacement filter I recently bought. However, unlike the original HEPA filters that come with the vacuum cleaner, these filters do not have a fabric liner inside. There is also nothing between the paper ribs to trap dust because I could thread a piece of thin wire right through the ribs. They are useless as filters. Revain kindly took them back, paid for return shipping and refunded my money.