Sanding sponge "Kamiyasu"! High durability! All-purpose! Outstanding usability! "Kamiyasu" is durable sanding sponge. Emery cloth which is hard to loose sanding force is on the durable sponge. Different from paper file, cutting surface is hard to be torn and getting wrinkles and creases. Sponge has just right flexibility and elasticity. By changing the thickness, it suits from curved to flat surfaces.