Review on Enhance Precision: Spyderco 400 Square Ceramic Sharpening Files, Ideal for Sharpening Intricate Tools by Jim Raju

These are great for trigger jobs. Ultra-fine edges and various shapes make it easy to polish sharp surfaces. I would estimate the abrasiveness of these stones to be around 3000 units. It doesn't give you a high gloss finish, but it does smooth the surface enough for crisp, clean breaks. Good hard surfaces show no wear after working with about 5 triggers. The leather case is a nice touch to keep it together but offers no protection from breakage. I recommend keeping them in a nice hard case if you don't want them to break.