EXPERT Standard Block for Long Life Sanding Wood and PaintSometimes there’s 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.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’ve tried it, you won’t look back.