Holds 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 often became clogged or broke. The only solution was to buy many sanding sheets, which led to high consumption and a lot of waste. Today, there are sanding sponges with Bosch Surface Structure. The Bosch Surface Structure combines advanced techniques for bonding and surface coating to optimally fix the grain to the substrate. It is so strong that the Bosch Expert Sanding Sponge Standard Block does not lose its grain when sanding around edges and corners. Additionally, clogging of the sanding sponge is minimized, as dust can simply be knocked out or washed off. There are also shapes for even pressure on the surface. Square sanding sponges are ideal for sanding flat surfaces and 90-degree edges. The Bosch Expert Sanding Sponge Standard Block is a revolution in hand sanding. Once you’ve used it, you’ll never want to use anything else. Length mm: 69, Width mm: 97, Height mm: 26, Dimensions mm: 69 x 97 x 26, Grit: Medium / Fine / Superfine, Product color: Orange / Yellow / Green.