A. The dark stone is about 800 grit. It is used for edge shaping.
B. The white stone is about 8000 grit and is used for final honing.
Both are 4" x 2" x 1/2". The manufacturer states that neither requires lubrication and that both clean up quickly with soap and water. It is our belief that they benefit from a bit of water during use (preferably with a drop of soap in it) to avoid any grain plugging. An ounce of prevention....
Both come with vinyl slip covers. Good toolbox stones.
Made in USA.