150 Grit, Drywall Sandpaper, No Hole, 9" Velour Backed Sanding Disc To Be Used With Foam Back Up Pad #440-00012, This Will Allow You To Remove & Reuse The Back Up Pad, To Be Used In Conjunction With TV #574-705 Reusable Foam Back Up Pad, Fits Porter Cable #7800 Dustless Sander.