This is a natural Japanese whetstone for sharpening straight razors. It is fine and hard delivering smooth edges. It can be used with naguras (slurry stones) or with a DMT abrasive card blade sold on Amazon for about $12. Honing instructions will be included.
Weight: 21 ounces or 594 grams
Dimensions: 6 L, 2.25 W, 7/8 H. The narrower part is 2 inches wide instead 2.25.