The lifting chain is the load -bearing chain of the gourd. Most of the good -quality hand -pour gourds will adopt 80 -level alloy steel to start the heavy chain. Some small workshops will use poor quality materials to make the lifting chain. When it is prone to deformation; it is now a hot summer. Excessive temperature and humid environment will also cause damage to the lifting chain and deformation. Covenant or overload can also cause chain deformation and affect use.