Shaped with curves and angles for sharpening any edge. USA made fine grit Alumina Ceramic is closed-cell and doesn’t wear with usage or time. Fine stones excel in polishing and professionally finishing edges. The stone has multiple fine grit sharpening surfaces including: a flat stone and a groove for de-burring and honing pointed objects. Holding the stone vertically on a tabletop and tilting it from one side to the other raises one edge off the tabletop creating a 20° angle (40° total angle) for sharpening knife blades. Both sides are elliptical. One side has a large radius for sharpening PlainEdges, the other smaller radius for SpyderEdges (serrations). Positioned on its side horizontally creates a 12.5° angle designed for scissors sharpening. A suede leather carry case doubles as a non-skid counter top pad for tabletop sharpening. To clean: wash stone in fresh water, scrub away steel particles using a powdered abrasive cleanser and a scouring pad. Rinse and dry. Temperature resistant, dishwasher and autoclave safe.