SOFT FOAM HAND SANDING BLOCK FLEXIBLE WITH HOOK AND LOOP GRIP FASTENING BACKING USED WITH DRY D.A. DISC 150MM (6") FINGER SLOTS FOR GRIP AND CONTROL SOFT BLOCK BUT STRONG BACKING TO KEEP DISC FLAT HAS A SERIES OF SLOTS THAT ALLOWS THE BLOCK TO ADJUST, WARP AND SHAPE TO THE SANDING ..