Good filter OEM replacement. Suitable for Dewalt DCV581H. The filter is durable, the main material of the fold is paper, there is a metal case on the inside of the clean side of the filter. On the dirty side of the filter is a layer of white membrane; probably the extra filtering that makes it HEPA. Be very careful when cleaning/flushing the filter. If you're using compressed air, make sure you set the compressed air to a lower level (50psi) or you'll rip off the outer membrane (ask me how Iโฆ