The Flexible Sanding Discs are one of the best ways to sand small areas that are either flat, concave, and even convex. They are 7/8" diameter and slightly flexible. The flexibility allows you to bend the disc while it is spinning to smooth and shape the surface of your project. These have worked great for relief carvers, figure carving, woodturning, and many others. Sanding is usually the dreaded part of most projects. These Flexible Sanding Discs can help speed up the sanding time for wonderful results. Snap on mandrel and discs sold separately.