Slick sanding boards from GodHand with adhesive pre-applied to one side. Double sided tape is all you need once that wears out to apply your favorite sandpaper or emery cloth to this perfectly flat and smooth acrylic bar set. One each of five different colors are included so that you can color code your grits. Pro Tip: The blocks are double sided, so stick sandpaper on both sides to have up to 10 different grits!!!!! I know, I know…. Genius! We sell the GodHand brand 15mm double sided tape made specifically for these bars. Sandpaper is not included.