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 often became clogged or broke. The only solution was to buy many sanding sheets, leading to high consumption and a lot of waste. Today, there are sanding foams with Bosch Surface Structure. The Bosch Surface Structure combines advanced bonding techniques and surface coating to optimally secure the grain on the backing. It is so strong that the Bosch Expert Combi Block does not lose its grain when sanding 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. Thanks to a rounded edge and a sharp-edged side, this sanding sponge set can easily reach and sand hard-to-access areas. The Bosch Expert Sanding Sponge Combi Block is a revolution in hand sanding. Once you use it, you won't want to use anything else. Length mm: 69, Width mm: 97, Height mm: 26, Dimensions mm: 69 x 97 x 26, Grit: fine.