Up to 4x better dust reduction than Bosch C420 sandpaper - When sanding workpieces with flat surfaces as well as curves and edges, you need different sanding blocks to find the right one for the shape you are working on. We have combined the hard side and the soft side of the EXPERT Hand Sanding Block Dual Density Set, 80 x 133 mm, to make it easier. You can use it to sand surfaces as well as curves and edges with little dust. This EXPERT hand sanding block Dual Density Set, 80 x 133 mm is a versatile sanding block for sanding workpieces with complex shapes. It has a high density side for sanding surfaces and a low density side for curves and edges. Both sides have a Velcro fastener for easy attachment and removal of sanding sheets. Our Bosch Particle Control technology ensures that dust gets into the sanding net without clogging it. The EXPERT Hand Sanding Block Dual Density Set, 80 x 133 mm, is an effective accessory for carpenters, painters and drywallers who need a versatile, low-dust sanding block for sanding surfaces, contours and edges. Easy to attach with Velcro fastener.