If you’ve every tried to sand the style lines in bodywork with a folded up piece of sand paper you know how easy it is to loose the sharpness of the details. These closed cell foam blocks are molded in 3 different hardnesses, in a wide range of profiles, to fit most detail sanding needs. Tapered round edges prevent gauging. Pliable and durable. Work great with Super-Flex Sandpaper (available in 40-220 grit). Made in USA.