Longer lifespan when sanding wood and paint. The Bosch Surface Structure combines advanced techniques for bonding and surface coating to optimally secure the grain on the substrate. It is so strong that the Bosch EXPERT Flex sanding pad does not lose its grit when sanding around edges and corners. Additionally, clogging of the sanding sponge is minimized, as dust can easily be knocked out or washed off. There are also shapes designed for even pressure on the surface.