Gator CeraMax sponges combine all the high performance features and benefits of our CeraMax sandpaper sheets into a convenient yet powerful sanding block. The CeraMax sandpaper is fused, on both sides of a soft memory foam block giving you ultimate sanding power and control while hand sanding. Couple these CeraMax sanding sponges with our zip sponge holder and you have the best hand sanding block on the market today.