Sanding sponge "Kamiyasu"! High durability! All-purpose! Outstanding usability!<br/> Kamiyasu is durable sanding sponge. Emery cloth which is hard to loose sanding force is on the durable sponge.<br/> Different from paper file, cutting surface is hard to be torn and getting wrinkles and creases.<br/> Sponge has just right flexibility and elasticity. By changing the thickness, it suits from curved to flat surfaces<br/> Grade: #4000, #6000, #8000, #10000 Quantity per package: 4 (one piece of each grade)