Lasts up to 5x longer than Bosch C420 Sandpaper Sometimes theres no substitute for hand sanding. The problem was that conventional sanding sheets wore out fast, clogged, or broke when sanding curves and edges. The old solution was to buy a lot of sanding sheets, leading to high consumption and waste. The new solution is sanding foams using Bosch Surface Structure. The Surface Structure combines advanced bonding and surface coating techniques to fix the grains to the backing. It's so strong that the Bosch EXPERT S471 Standard Sanding Block doesnt lose grit when sanding around edges and corners. It also minimises clogging and dust can simply be knocked or washed off the flexible surface. It also shapes to surfaces with even pressure. Square sanding sponges are ideal for sanding flat surfaces and 90 degree edges. The Bosch EXPERT S471 Standard Sanding Block is a revolution in hand sanding. Once youve tried it, you wont look back. Tested in Bosch labs according to Bosch standard pr