These 3M Hookit blocks combine the lightweight flexibility of traditional foam blocks with the dust extraction power and control of rigid dust-free sanding blocks. They feature a convex face which can help you easily restore contours and bodylines, while still providing a firm backing for abrasives. They include a vacuum regulator that lets the operator adjust suction for easier block control when sanding. There are 9 total brand new blocks. (A few of the boxes have minor flaws)