One side (dark color) is Rough Grain Whetstone#400:
For removing large chips or dents,heavy rust and imperfections,and creating a razor sharp edge;

One side (bright color) is Medium Grain Whetstone#1000:
For most typical, everyday little damage, making the blade more sharp and good shape

Length: 7"
Width: 2 5/16"
Thickness: 1 3/16"
Package weight: 1 lb