3'' tapered double sided Ceramic 1 micron grit and Diamond 25 micron grit stone. Smooth, flat surface allows for easy sharpening. Uses no oil or water. Stone folds into 4 3/8'' black Zytel handle for convenient storage when not in use. Depress button lock to flip the stone out of the handle. In the open or closed position the sharpener resembles a pocket knife. Hang packaged.