The Tin Lead Stick is a highly economic sticks of solid graphite leads. Its lower melting temperature makes the lead-based slightly easier to use than lead-free solder. It is made from virgin lead & zinc make sure no contaminants. It is ideal on panel work where metal area have overlaps or are joined to offer a solid foundation for filling. The Tin Lead Stick is ideal to build edges on opening panels in order to close as well as tighten gaps for the perfect look.