This product is sold exclusively at the actual store in Sanjo.

These are shells created in the process of manufacturing pegs.

The round steel material is heated to bright red until it reaches about 1100°C, and the cross section is crushed into an oval shape at one stroke with a force as powerful as about 1 ton.
The pegs are removed from the crushed steel, and the blanking is completed.

It can be used as a stove over a fire pit.
It can also be used in a variety of other ways, such as hanging a sierra cup over it!

The key point is the subtle peg removal marks that are noticed by those who know what they are doing!