Specifications:

4-inch one electric charge (5 batteries)

4-inch two electricity and one charge (5 batteries)

4-inch one electric charge (10 batteries)

4-inch two electricity and one charge (10 batteries)

6-inch one electric charge (5 batteries)

6-inch two electricity and one charge (5 batteries)

6-inch one electric charge (10 batteries)

6-inch two electricity and one charge (10 batteries)

Bare Metal