You donít need to spend precious time screwing around with sanding blocks! Unwrap and start sanding away with our sanding sponges. The sanding sponges we offer are industrial-quality tools manufactured in Germany. Their quality makes sanding faster and easier. The sponge is firmer than one might expect (it does react to finger pressure), but is still flexible enough to adapt itself to uneven or contoured materials. The grit is bound to the block with a strong plastic resin!