WB1 Motor Guard Wonder-Block is a rugged, ergonomically designed block designed for maximum gripping power over flat to slightly curved surfaces. Designed for all typed of paper, this block flexes to conform to the panel shape. * Unique profile for powerful grip. * Ultra flat face for flawless sanding. * Users of these unique Sanding Blocks report reduced paint prep times, reduced material consumption and increased paint department productivity. * Also ideal for woodworking and home improvement. * Highest quality construction