Unique head shape and flexible plastic shaft to get into hard to reach areas that ordinary sandpaper or files can't. Disposable tool for use on wood, plastic or metal to sand, shape, polish, smooth surfaces. Marine grade epoxy secures the silicon Carbide grit to plastic shafts for use in either wet or dry applications. 6 inch long shafts are double sided for (8)120 grit black and (8)180 grit grey ends.