Cut and attach to make your original Kamiyasu! Various objects can be used as a backing material making your original filing tool that fits the shape of the targeted object. Just cut attach and polish! Make your desired sanding sponge with a backing material out of all sorts of stuff! Kamiyasu is a cutting-type polishing material with powerful adhesion. Thanks to its powerful adhesion FF boards and many other objects can use as backing materials. By using a target board of the desired shape sharpening becomes easier. Why use Kamiyasu attach to a backing material? With Kamiyasu attached to a backing material it becomes a firmer filing tool with cushioning properties enabling an even and entire filing even on a slightly undulating flat surface. ? Difference from Edging File Edging File is ideal for creating a firm surface or edge with precision but it has no cushioning properties that cannot neatly create subtly undulating surfaces. With Kamiyasu attached to a backing material you can create the look as if a tight edge by leaving a slightly curved surface while smoothing surfaces and connecting the sides to a fixed surface. ? Difference from Kamiyasu-Sanding Stick 10mm For fine details Kamiyasu-Sanding Stick 10mm is more convenient but for smoothing surfaces attaching Kamityasu with a backing material makes the smoothing process easier. It is also less likely to distort the edges when smoothing surfaces near the edges. Excellent compatibility with any pen sander Just cut it to fit the shape of the pen sander tip arbor and paste it on. It is highly durable and works well with pen sanders for high-speed filing.