Knife sharpening stone, also known as a whetstone. It is a tool used to sharpen the edge of a knife or other blade.
This knife sharpener has two sides, likely with different grits for coarse and fine sharpening.
It is suitable for sharpening most kitchen knives and tools, including steak knives, chef knives, and scissors.
The stone is made from professional-grade white corundum, which is known for its durability and hardness.
The packaging indicates that it is a "non-slip sharpening stone".