Lasts up to 5 times longer than standard sandpaper - Sometimes there is no alternative to hand sanding. The problem was that conventional sanding sheets wore out quickly when sanding curves and edges. They were also often clogged or broke. The only solution was to buy a lot of sanding sheets, which resulted in high consumption and a lot of waste. Today, there are sanding foams with Bosch Surface Structure. Bosch Surface Structure combines advanced techniques for bonding as well as surface coating to fix the grain to the backing in the best possible way. It is so strong that the Bosch Expert Sanding Foam Standard Block will not lose grit when sanding around edges and corners. It also minimizes clogging of the sanding sponge, as dust can simply be tapped out or washed away. Shapes are also available for even pressure on the surface. Square sanding sponges are ideal for sanding flat surfaces and 90-degree edges. The Bosch Expert Sanding Foam Standard Block is a revolution in hand sanding. Once you use it, you'll never want anything else.