Compatible model: compatible with Shark NV581, NV581QBL, NV581QG, NV581QPR, NV581QR, NV581QT, NV581QTG, NV586, NV585 vacuum cleaner only.   Please check your vacuum model before purchasing! If you are unsure which filter you need to purchase, please feel free to contact us and we will do our best to assist you.   Compare to part # XFFT580 & XHEP580   Find My Model Number 1. Check your box On the bottom of your box, you should see the model number near the bar code. 2. Check your unit The main body of the vacuum (back of the unit) should have a rating label that features your model number. 3. Check your manual Your product's model number is listed on the front cover of your instruction booklet.   *Filter dust to reduce dust, and other from permeating into the air you breathe *Solid and , long service life *Easy to install and reliable to use     Package Includes: 2x Post Filter, 4 Set Foam Felt Filter