Coal cake belongs to daily necessities and can be purchased in coal cake sales center or coal cake factory. According to Baidu map, there is no briquette sales center or briquette factory in Wugouying, Xiping County. You can go to Shangqiu briquette sales point 263 kilometers away to buy it.

The manufacturing method of briquette is: the motion force drives two rollers to rotate relatively, and there are corresponding hemispherical and concave-convex water on the rollers, which are evenly stirred according to a proper proportion, and the formed coal is squeezed out by pits.