DIFFERENT SHAPES:You will get 2 round hand sanding blocks, 1 mouse-shaped sanding block and 1 cleaning brush. Hook & Loop Sanding Discs. Roll Lock Sanding Discs. Sander Pad & Sanding Blocks. PU BACKING PLATE:Hand sanding blocks are made from a sturdy, yet flexible material—polyurethane, which greatly dampens the vibration when sanding.