Check the listing for details. Spyderco Replacement Sharpening Medium Stone 204M1, Factory Second (Grade A). Color: Brown, Condition: New. Listed at 9.48 USD. one medium grit ceramic stone included in each sale. Spyderco Replacement medium Sharpening Stone 204M1 (Factory Second) Never been used. This medium Grit ceramic stone is a replacement item for the 204MF Tri-Angle Sharpmaker sharpening system. 204M1 stone is sold individually and fits into the 204 Tri-Angle Sharpmaker sharpening system Or can be used for freehand sharpening. What is a Factory Second? A Factory Second is a product that for one reason or another was rejected for standard retail sale. A sharping stone becomes a second for any number of reasons these stones are safe to use flaws will be of a cosmetic nature and will not affect sharpening. Factory Seconds offer brand name sharpener quality at incredible savings. (Ultra Fine stones available in separate listing)